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Snowdrops (Galanthus).—These are most effective in clumps. They may be planted at any time from September to December, and left alone for three or four years, when they may be taken up and divided. They grow best in a light, rich soil.

Snowdrop Tree.—See "Halesia."

Snowflake.—See "Leucojum."

Snow in Summer.—See "Arabis."

Soil and its Treatment.—Loam is a mixture of clay and sand. When the former predominates it is termed heavy loam, and when the latter abounds it is called light.

Marl is a compound of chalk and clay, or chalk and loam. Though suitable for certain fruit-trees and a few other things, few flowers will grow in it.

Drainage is one of the most important considerations in the cultivation of flowers. Should the soil be clayey, and hold water, make V-shaped drains, 3 ft. below the surface, and let 2-in. pipes lead to a deep hole made at the lowest part of the garden and filled with brick rubbish, or other porous substances, through which the water may drain; otherwise the cold, damp earth will rot the roots of the plants.

Trenching is the process of digging deep, so as to loosen and expose the soil as much as possible to the action of the air. If this is done in the autumn or early winter to a new garden, it is best to dig it deep, say about 2 ft, and leave it in large clods to the pulverizing action of the frost, after which it is easily raked level for spring planting. If the clods are turned over the grass will rot and help to improve the ground; new land thus treated will not require manuring the first year. Should the ground be clayey, fine ashes or coarse sand thrown over the rough clods after trenching will greatly improve it.

Digging should be done when the ground is fairly dry, and about one spade deep. Avoid treading it down as much as possible.

Hoeing must be constantly attended to, both to prevent the soil becoming exhausted of its nourishment by the rapid growth of weeds, and because when the surface becomes hard and cracked the rain runs through the deep fissures, leaving the surface soil dry and the roots of the plants unnourished.

Mulching consists in spreading a layer of stable manure, about 3 in. deep, over the roots of trees and plants in the autumn to keep them warm and moist. The manure may be forked into the soil in the spring.

Watering the plants carefully is of great consequence. Evening or early morning is the best time, and one copious application is far better than little and often. Water may be given to the roots at any time, but should not be sprinkled over the leaves in a hot sun nor in cold weather. Plants having a soft or woolly foliage should never be wetted overhead, but those with hard and shiny leaves may be freely syringed, especially when in full growth.

Solanum.—Showy greenhouse shrubs, some of which have ornamental foliage. The soil in which they are grown should be light and rich. Cuttings planted in sand under glass strike readily. The tender annual varieties may be sown on a hotbed in spring, and placed in the border at the end of May in a dry, sheltered situation, where they will flower in June. Height, 1 ft. and upwards.

Soldanellas.—These small herbaceous perennials should find a place in all Alpine collections. They grow best in sandy peat, or in leaf-mould with a liberal addition of sand, and they require a moderate amount of moisture. They may be increased by dividing the roots in April. They flower from March to May. Height, 4 in. or 5 in.

Solidago (Golden Rod).—A useful hardy perennial for the back of borders. Throughout late summer and autumn it produces masses of golden flowers. It is not over-particular as to soil, and may be increased by dividing the root in the spring. It increases very rapidly. Height, 2 ft. to 6 ft.

Solomon's Seal (Polygonatum Multiflorum).—A graceful hardy plant bearing white pendulent flowers on long curving stems. Plant freely in light, rich soil, in a shady position or under trees. The plants should not be disturbed, even by digging among the roots. Flowers in May. Height, 2 ft.

Soot-Water.—For room and window plants soot-water has this advantage over coarse animal manures, that while the latter are unhealthy and apt to taint the air, the former is purifying and has no unpleasant smell. It is easily made by tying a little soot in a coarse canvas bag and immersing it in a pail of water. It should be applied in a clear, thin state to plants in bud or in full growth during the summer months.

Sorrel.—Sow in March or April in any garden soil, thin out to 1 ft. apart. It is desirable to cut away the flower-stems and to divide the roots every two or three years. The plants may be forced for winter use.

Southernwood (Artemisia Arborea).—Any soil suits this odoriferous bush, and it is readily increased by cuttings or by division.

Sparaxis.—Closely allied to the Ixias, equally beautiful and varied in colour, but rather dwarfer and compact in growth. Invaluable for pot-culture. For outdoor cultivation plant them early in September, 5 or 6 in. deep, on a sheltered border, in rich, well-drained, loamy soil. Protect from frost and wet in the winter, but keep the roots moist while they are growing. For indoor cultivation plant four to six bulbs in a 5-in. pot, plunge in ashes in a cold frame, withholding water till the plants appear. When making full growth remove them to a sunny window or conservatory, and water them carefully. They will bloom in March or April. Height, 3 ft.

Sparmannia Africana.—An exceedingly handsome and attractive greenhouse evergreen shrub, thriving best in loam and peat. Cuttings may be struck in sand under glass. May is its flowering season. Height, 10 ft.

Spartium Junceum(Yellow Broom).—A hardy evergreen shrub which will grow in any soil, and is propagated by seeds. It flowers in August. Height, 6 ft.

Specularia Speculum.—See "Venus's Looking-Glass."

Spergula Pilfera.—May be grown in any moist situation in sandy soil. It is of little value.

Sphenogyne Speciosa.—An elegant hardy annual. Sow the seed early in spring on a gentle hotbed in loam and peat, harden off, and transplant at the end of May to a soil composed of loam and leaf-mould, if peat cannot be obtained. The bloom is produced in July. Height, 1 ft.

Spider Wort.—See "Commelina" and "Tradescantia."

Spigelia Marilandica.—From August to October this hardy perennial produces tubular crimson and yellow flowers. It finds a congenial home in damp peat, shaded from the sun, and may be propagated by cuttings in loam and peat under glass. Height, 1 ft.

Spinach.—For summer use sow the round-seeded kinds at intervals of two or three weeks from February to the end of July in rows 1 ft. apart, cover with the finest of soil, and thin out to a distance of 3 or 4 in. In dry weather give a liberal supply of manure water. Pull before it runs to seed. For winter use sow the prickly-seeded variety in August and September, and thin the plants out 9 in. apart. If the ground is hot and dry, the seed should be soaked for twenty-four hours before it is sown. New Zealand Spinach may be sown in the open during May, choosing the warmest spot for its growth; but it is best to sow it in heat in March, keeping the soil fairly moist, and, after hardening it off, to plant it out in June, 3 ft. apart Sow Perpetual Spinach or Spinach Beet in March in drills 1 ft. apart. Cut the leaves frequently, when a fresh crop will be produced.

Spiraeas.—Placed in the open ground these make splendid plants, and are not particular as to soil, though a moist, rich one is preferable. For forcing, plant the clumps in 6-in. pots, and keep them in a cool frame until they are well rooted. They may then be removed indoors and forced rapidly, supplying them with an abundance of water. Their elegant flower spikes are invaluable for bouquets and table decoration. The shrubby kinds are increased by layers or cuttings of the young wood, the herbaceous varieties by division of the roots in autumn. Spiraea Aruncus, if potted early in the autumn, is very valuable for winter decoration. Spiraeas bloom at different periods, from May to August, and vary in height, 3 or 4 ft. being the general growth.

Spruce Firs.—See "Abies."

Stachys Coccinea.—This scarlet hardy annual is fine for bees. It may be grown in any soil from seed sown in March or April. Height, 1 ft.

Stachys Lanata.—A hardy perennial which will grow in any soil, and bears division. It flowers in July. Height, 2 ft.

Staphylea Colchica(Mexican Bladder Nut).—This beautiful free-flowering shrub will grow in any garden soil, and produces bunches of fragrant, delicate white flowers in June. It forces well, and may be made to flower at Easter by potting it in rich, light soil, placing it in a cold frame till the middle of January, keeping the roots moist, then bringing it into the warm house. It may be propagated by suckers from the roots, by layers, or by cuttings taken in autumn.

Star Flower.—See "Trientalis."

Star of Bethlehem.—See "Ornithogalum."

Statice (Sea Lavender).—The greenhouse and frame varieties succeed best in sandy loam and peat, and may be increased by cuttings placed under a bell-glass or in a warm pit. The hardy herbaceous kinds are very suitable for the front of flower borders, and may be freely increased by seeds or division. The annuals, if sown in March, will produce flowers in July. Statices require a good amount of water, but thorough drainage must be ensured. If the flowers are dried they will keep their colour for a considerable time. Height, 1 ft. to 1-1/2 ft.

Stauntonia Latifolia.—A greenhouse evergreen climbing plant, which needs a peat and loam soil and plenty of room for its roots. It flowers in April, and is increased by cuttings planted in sand under glass, with a gentle heat. Height, 10 ft.

Stenactis (Fleabane).—Showy hardy perennials which make fine bedding plants. They may be grown from seed, which is produced in great quantities, and merely requires the same treatment as other perennials, or they may be propagated by dividing the plants. They bloom in July. Height, 2 ft.

Stephanotis.—This pretty evergreen twining plant is most suitable for the greenhouse, and flourishes in a mixture of loam and leaf-mould. It flowers in May, and is increased by cuttings struck in heat. Height, 10 ft.

Sternbergia Lutea.—A hardy perennial which produces bright yellow flowers in August. It likes a rich soil, and is propagated by off-sets. Height, 6 in.

Stipa Pennata (Feather Grass).—One of the most graceful of our ornamental grasses, and most attractive in the border. The seed may be sown early in March, keeping the ground moist until it has germinated, and it is also increased by division. Height, 2 ft.

Stobæa Purpurea.—A hardy border plant with long spiny foliage, and bearing from July to September large light blue flowers. It requires a light, rich soil. Young cuttings may be struck in sand. Height, 1 ft.

Stocks—

ANNUAL, OR TEN WEEKS' STOCKS.—Sow the seeds in February, March, April, and May for succession; those sown in May will continue to flower till Christmas. The soil should be rich, and occasionally a little manure-water may be given. Another sowing may be made in August and September. When the plants have several leaves pot off singly in vegetable loam and river sand. Height, 1 ft. to 1-1/2 ft.

BROMPTON.—Sow very thinly during the first week in May in a rich, light, sandy border, with an eastern aspect. When 2 or 3 in. high, thin out to 9 in. apart. Those taken out may be re-planted in the flower border, 9 in. from each other. In transplanting reject those plants having a long tap-root: they generally prove to be single. If the following winter be severe they must be protected with mats. Any desirable varieties may be propagated by cuttings, which root readily under glass if kept shaded. Should it be desirable to transplant them to another part of the garden, March or April will be found the best time to remove them. Shade the plants till they are established, and use liquid manure till they begin to flower.

GREENHOUSE OR SHRUBBY species grow best in a mixture of light soil and sand, and cuttings of these Stocks root readily under glass.

NIGHT-SCENTED STOCKS.—See "Mathiola Bicornis." If Emperor, Imperial, or Intermediate Stocks are sown in March or April, they will flower in the autumn; if sown in June or July they will flower during the following June, and throughout the summer and autumn.

Stokesia Cyanea.—A handsome herbaceous perennial which is quite hardy, but owing to the late period at which it flowers its blooms are liable to be cut off by frosts. It is therefore more suitable for a cool house than the open air, unless the warmest and most sheltered position be assigned to it. A rich, sandy soil is indispensable for its growth. It may be increased by dividing the roots in spring. The flowers are produced from October to December. Height, 1-1/2 ft.

Stonecrop.—See "Sedum."

Strawberries.—The soil most suitable for the growth of this fruit is a rich, deep, adhesive loam. July or early in August is the best time to make new beds, but if the ground be not then available runners from the old plants may be planted in peat on a north border and lifted with good balls of earth to their permanent bed in the spring. Set them firmly in rows 2 ft. apart and 18 in. from plant to plant. Spread out the roots and avoid deep planting. Remove from the old plants all runners not required for new beds before they take root, as they exhaust the crown. In dry seasons liquid manure is highly beneficial. Some growers give supports to the fruit by means of forked-shaped pegs, while others lay straw down to keep the fruit free from grit. Keep a sharp look-out for snails and slugs. King of the Earlies, Auguste Nicaise, Royal Sovereign, Vicomtesse Héricart de Thury, Gunton Park, President, Sir Joseph Paxton, Lord Suffield, Noble, and Samuel Bradley are excellent sorts. For Ornamental Strawberries, see "Fragaria Indica."

Strawberry Tree.—See "Arbutus."

Streptocarpus (Cape Primrose).—This plant is a greenhouse perennial, showing great variety of colours, from white to violet and crimson, and is of neat habit. A light and rather rich soil or vegetable mould suits it best. Seed sown in February in slight heat will produce plants for flowering in July; that sown in March or April will flower in August and September. Grow slowly in small pots, and in February put them in their flowering pots. Give plenty of air and shade them from the sun. It may also be increased by division, or leaf-cuttings may be taken under a bell-glass. The plants like plenty of water, but need good drainage. Height, 9 in.

Streptosolen Jamesoni.—A good compost for this greenhouse evergreen shrub is two parts sandy loam, one part leaf-mould, and a little silver sand. During growth it needs a liberal supply of water and to be kept near the glass; only a small amount of moisture should be given in winter. In March cut it into shape, and re-pot it as soon as new growth starts. During the summer syringe it frequently to keep off red spider, and during winter maintain a temperature of 55 degrees.

Stylophorum (Celandine Poppy, or Poppywort).—During May and June this hardy and handsome plant produces fine yellow flowers. It accommodates itself to any soil, but prefers a rich, light one, and can be increased by seed sown in autumn or early spring. Height, 1-1/2 ft.

Styrax.—Ornamental shrubs requiring a light soil for their cultivation. S. Japonica has Snowdrop-like flowers, and S. Obasa Lily-of-the-Valley-like scented flowers. They are best propagated by layers. Height, 4 ft. to 10 ft.

Sunflower.—See "Helianthus."

Swainsonia Galegifolia Alba.—A graceful and charming cool greenhouse plant, with Fern-like evergreen foliage and pure white flowers, which are borne from April to November. The soil most suitable for it is a mixture of loam and sandy peat. Cuttings of the young growth planted in sand under glass strike readily. Height, 2 ft.

Swallow Wort.—See "Asclepias."

Swamp Lilies.—See "Zephyranthes."

Swan River Daisy.—See "Brachycome."

Sweet Alyssum.—See "Alyssum."

Sweet Flag.—See "Acorus."

Sweet Peas.—See "Peas, Sweet."

Sweet Rocket.—See "Rocket."

Sweet Scabious.—See "Scabious."

Sweet Sultan.—Sweet-scented, Thistle-shaped hardy annual flowers, which are very useful for cutting. They may be raised in any garden soil from seed sown in March or April, and will flower in August. Height, 1-1/2 ft.

Sweet William.—Well-known hardy perennials, and deservedly favorite border plants, which may be grown in any good soil; but to have them to perfection they should be placed in light, loamy ground mixed with a little old manure and sand. They can be raised with little trouble from seed sown thinly at any time between March and midsummer where they are to bloom, and may also be increased by dividing the old plants in spring. They produce their flowers in July. Height, 1-1/2 ft.

Symphoricarpus (Snowberry).—A handsome species of St. Peter's Wort. The shrubs will grow in any ordinary soil, are hardy, and readily propagated by suckers, which are produced abundantly; or cuttings may be taken either in spring or autumn. They bloom in August. Height, 4 ft.

Symphytum Caucasicum.—Hardy perennials. They will grow in any soil or situation, even thriving under the shade of trees, and may be increased by division. June is the month in which they flower. Height, 3 ft.

Syringa (Lilac.)—There are many choice varieties of these favourite shrubs, but any of them may be grown in a tolerably good soil. They are propagated by layers or by suckers from the root. They bloom in May or June. Height varies from 4 ft. to 12 ft.

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Saffron, Spring.—See "Bulbocodium."

Sage.—This useful herb likes a rich, light soil, and is propagated by division of the root, by cuttings, or by seed.

Saintpaulia Ionantha.—The leaves of this plant spread themselves laterally just over the soil, forming a rosette, in the centre of which spring up large violet-like flowers. It is a continuous bloomer. A rather light, rich soil or vegetable mould suits it best. The seed, which is very minute, should be sown early in spring, in gentle heat: to prevent it being washed away, the pots may stand up to the rims in water for a while when the ground wants moisture. Height, 1 ft.

St. John's Wort.—See "Hypericum."

Salix Reticulata.—A dwarf creeping plant whose dark green leaves eminently fit it for the rock-work or carpet bedding. It will grow in any soil, but prefers a moist one, and produces unattractive brown flowers in September. Propagated in spring by detaching rooted portions from the parent plant and planting them in moist, sandy loam. Height, 2 in.

Salpiglossis.—Very beautiful half-hardy annuals which are greatly prized for cut bloom. A light but not over-rich soil suits them best. The seed may be sown in the open border early in spring, or preferably on a hotbed at the same period. For early flowering raise the plants in the autumn, and winter them in a frame or greenhouse. Flowers are produced in July and August. Height, 2 ft.

Salsafy (Vegetable Oyster).—Sow the seed in any good garden soil—deep sandy loam is best—towards the end of April in drills 1 ft. apart, and thin the plants out to a distance of 6 in. from each other. The roots may remain in the ground till required for use, or be lifted in October and stored in the same way as Beet or Carrots. They are prepared for table in the same manner as Parsnips, and are also used for flavoring soups.

Salvia.—Very showy flowers, well worth cultivating, and easily grown in a rich, light soil. The annuals and biennials may be sown in the open early in spring. The herbaceous kinds are increased by dividing the roots; the shrubby varieties by cuttings of the young wood planted under glass in March; while the stove species require to be placed in heat. They flower in August in the open. Heights vary, according to the kinds, but S. Coccinea and S. Patens, which are most commonly met with in gardens, grow to a height of 2 ft.

Sambucus (The Elder).—Useful deciduous shrubs. S. Nigra Aurea has golden foliage, and is suitable for town gardens. The silvery variegated variety (Variegata), is fine for contrasting with others. They may all be propagated by cuttings or by division. Flower in June.

Sand Wort.—See "Arenaria."

Sanguinaria Canadensis (Bloodroot).—A hardy perennial, curious both in leaf and flower. It requires a light, sandy soil, shade, and moisture; is propagated by seed sown in July, also by division of the tuberous roots, and it blooms in March. The tubers should be planted 5 in. deep and 3 in. apart. Height, 6 in.

Santolina.—This hardy evergreen shrub grows freely in any soil. It flowers in July, and is increased by cuttings. Height, 2 ft.

Sanvitalia.—Interesting, hardy annual trailers, which may be readily raised from seed sown in March or April, and merely require ordinary treatment. They produce their golden and brown and yellow flowers in July. Height, 1 ft.

Saponaria.—These grow best in a mixture of sandy loam and peat or decayed vegetable soil. The annuals may be sown either in autumn, and wintered in a frame, or in the open in April. The perennials are increased by seed or by division of the root, and young cuttings of the branching species root freely if planted under glass. S. Ocymoides, on account of its trailing nature, and S. Calabrica make fine rock-work plants. The leaves of S. Officinalis, or Soap Plant, if stirred in water form a lather strong enough to remove grease spots. They bloom in June and July. Height, 6 in. to 2 ft.

Sarracenia.—Curious herbaceous plants, requiring to be grown in pots of rough peat, filled up with sphagnum moss, in a moderately cool house having a moist atmosphere. They flower in June, and are increased by division. Height, from 9 in. to 1 ft.

Sauromatum Guttatum.—This makes a good window or cool greenhouse plant. Pot the tuber in good loam and leaf-soil, and keep the mould only just damp until the foliage, which follows the flowers, appears. When the foliage fails, keep the tubers dry till spring. If grown out of doors the tubers must be lifted before frost sets in.

Savoys.—Sow the seed in March or April, and when the plants are 2 in. high remove them to a nursery-bed, selecting the strongest first. Let them remain till they are about 6 in. high, then transplant them, 18 in. apart, in well-manured soil. Their flavour is greatly improved if they are frozen before being cut for use.

Saxifrage.—These beautiful Alpine perennials delight in a light, sandy soil, and are easily propagated by seed or division. It is most convenient to grow the rare and tender kinds in pots, as they require the protection of a frame in winter. Saxifraga Sibthorpii is very suitable for the lower and damper parts of rock-work; it is hardy, and sheds its seed freely. S. Umbrosa (London Pride) makes a neat border, and is also useful for rock-work. S. Sarmentosa (Mother-of-Thousands) is a fine hanging plant for greenhouse or window. They flower in April. Height, mostly 4 in. to 6 in., but some grow as high as 1-1/2 ft.

Scabious.—Ornamental and floriferous hardy biennials, which grow freely in common soil. The seed may be sown at any time between March and midsummer; transplant in the autumn. They bloom in June. Height, 1 ft to 3 ft. (See also "Cephalaria.")

Scale.—Red Scale may be easily overcome with a strong solution of soft soap applied with a sponge. White Scale is harder to deal with. Syringe frequently with strong soapsuds heated to 120 degrees. If the plant is badly attacked it is best to destroy it.

Schizanthus.—Extremely beautiful and showy annuals. A rather poor, light soil is most suitable for their growth. For early flowering sow the seed in autumn, and keep the young plants in a frame or greenhouse throughout the winter. For a succession of bloom sow in the open border early in the spring. They flower in July and August. Height, 2 ft.

Schizopetalum.—This singular and delightfully fragrant annual does best in a mixture of loam, peat, and sand, or sandy loam and leaf-mould. Sow the seed in pots in the spring, place in a greenhouse, and when large enough to handle, plant out in the open border, or it may be kept in an airy part of the house, where it will bloom in June. Height, 1 ft.

Schizostylis Coccinea (Crimson Flag, or Kaffre Lily).—A most lovely autumn-blooming plant, producing abundant spikes of Izia-like flowers about 2 ft. high. It is suitable for pot-culture or planting outdoors, and is quite hardy. It requires a rich, light soil.

Scillas (Squills).—Very useful spring-flowering bulbs. They are hardy, and do well in any position in light soil. When mixed with Crocuses and Snowdrops they produce a very charming effect. To get perfection of bloom they require deep planting. S. Siberica especially looks well when grown in pots with Snowdrops. Scilla roots are poisonous. General height, 1 ft.

Scorzonera.—Sow in March in light soil in rows 18 in. apart. Thin the plants out to about 7 in. one from the other. They may perhaps be ready for use in August, but to have large roots they should be left till they are two years old. They may remain in the ground till wanted for use, or they may be lifted in October and stored like Beet, etc. This vegetable is scraped and thrown into cold water for a few hours, then boiled in the same way as Carrots and Parsnips.

Scutellaria.—These plants will grow in any good soil. The hardy perennials flower in July. The greenhouse varieties merely require protecting in the winter. They all bear division of the root, and are easily raised from seed. Height, 1-1/2 ft.

Scyphanthus.—An elegant and curious trailer, which is best grown in a loamy soil. It may be increased from seed sown in April, and it flowers in August. Height, 2 ft.

Sea Cabbage.—See "Crambe Cordifolia."

Seakale.—The readiest way of propagating this useful vegetable is by off-sets, but it may be raised from seed sown in March or April in rows 1 ft. apart. Thin out the young plants to 6 in. in the rows, and transplant in February or March into well-trenched, deep, rich soil in rows 2 ft. apart and the plants 15 in. asunder. Keep the plants to one crown, or shoot, and remove all flower-shoots as they appear. In dry weather give a liberal quantity of liquid manure. Cropping may commence after the roots have been planted two years.

Sea Lavender.—See "Statice."

Sea Milkweed.—See "Glaux."

Sedum (Stonecrop).—This well-known hardy perennial is suitable for pots or rock-work. It delights in a light, sandy soil, and is readily increased by division or cuttings. It flowers in June or July. Height, 3 in.

Seed-Sowing.—Two of the most important points in the sowing of seed are the proper condition of the ground and the regular and uniform depth at which the seed is sown. Seeds require light, heat, air, and moisture for their germination. The ground should be light, and in such a condition that the young roots can easily penetrate it, and in all cases should be freshly dug so as to communicate air and moisture: it should be neither too wet nor too dry. The most favourable time for seed-sowing is just before a gentle rain. If sown too early on cold, wet ground, the seed is apt to rot; when sown too shallow in a dry time, there may not be sufficient moisture to cause it to sprout. The seed should be sown evenly. The size of a seed is a nearly safe guide as to the depth at which it should be sown. For instance, Beans and Peas of all kinds should be sown about a couple of inches deep, while very small flower-seeds merely require to be just covered. As to the time for sowing, see "Annuals," "Biennials," and "Perennials."

Seeds, the Protection of.—In order to protect seeds against birds, insects, and rodents, soak them in water containing 20 or 25 per cent, of mineral oil. Vegetable seeds, such as Haricot Beans and Peas, should be soaked for twelve hours, and the pips of Apples and Pears for double that time. For soaking the finer seeds, bitter liquids, such as that of Quassia and Gentian, should be used.

Sempervivum (Houseleek).—The hardy kinds are well known, and may often be seen growing on the roofs of cottages and on walls. They make good rock-work plants, and are easily increased by off-sets. The more tender kinds are suitable for the greenhouse. These should be planted in sandy loam and old brick rubbish. They require but very little water; more may be given when they are in flower. Cuttings, after being laid aside for a day or two to dry, will soon make root. Height, 6 in.

Senecio Pulcher (Noble Crimson Groundsel).—A warm position and a deep, rich, well-drained soil are needed for this flower. It may be propagated by cutting the roots into pieces 5 or 6 in. long, and dibbling them into light soil. It is also increased by the rootlets, which send up small growths in spring. Protect from damp and frost, and keep a sharp look-out for slugs. The flowers are produced in autumn. Height, 3 ft.

Senna, Bladder.—See "Colutea."

Sensitive Plant.—See "Mimosa."

Shallots.—Plant the bulbs in November, or in February or March, in rows 9 in. apart, and the bulbs 6 in. one from the other. In July, when the tops are dying down, lift the bulbs, lay them in the sunshine to dry, then store them in a cool place.

Shamrock.—See "Trifolium Repens."

Sheep Scabious.—See "Jasione."

Shortia Galacifolia.—A hardy, creeping Alpine evergreen, having oval leaves, slightly notched at the margins, which turn to a brilliant crimson during the autumn and winter months. In April and May it produces pearly-white flowers, somewhat Campanulate in form. It may be planted in early autumn or spring. A light, rich soil suits it best, and it delights in partial shade. It is a lovely plant for rock-work. Height, 6 in.

Shrubs.—Deciduous shrubs may be transplanted at any time during late autumn or winter when the ground is not too wet. Evergreen shrubs may be moved either early in autumn or in April or May, damp, warm, but not sunny weather being most suitable for the operation. They rejoice in a clean, healthy soil, such as good loam; animal manure does not agree with them, but wood ashes, or charcoal powder with a little guano, may be used. Cuttings of shrubs or trees may be taken in September, placed in a mixture of sandy loam and leaf-mould with 1/2 in. of sand on top, and covered with a hand-glass; 5 to 8 in. is a good length for the cuttings, all of which, with the exception of about 1 in., should be buried, and preferably with a heel of old wood. Keep the soil just damp and give shade.

Shrubs for Lawns.—Monkey Puzzle (Araucaria Imbricata)—mix wood ashes and burnt refuse with the soil; Thujopsis Delabrata, Thujopsis Borealis (of taller growth), Irish Yews, Cupressus Lawsoniana Erecta Viridis, Thujas Orientalis, Vervaeneana, Semperaurescens, Standard Rhododendrons, Standard and Pyramid Hollies, Yucca Gloriosa (a perfect picture), Yucca Recurva (the best hardy plant for vases). The Cercis tree is also well adapted for lawns.

Sicyos.—This hardy annual somewhat resembles the Cucumber, but is scarcely worth growing except as a curiosity. The seeds are sown on a hotbed in spring, potted off when strong enough, and transferred to the open border early in June. It is a climber, and flowers in August. Height, 3 ft.

Sidalcea.—Very pretty hardy perennials, of easy culture. S. Candida has pure white flowers closely arranged on the upper part of the stems. S. Malvaeflora bears beautifully fringed, satiny pink flowers. They will grow in any good soil from seed sown in autumn and protected during the winter, or they may be increased by division of the roots. Height, 3 ft.

Silene (Catchfly).—Elegant plants, delighting in a light, rich soil. Sow the seeds of the annual varieties early in April where they are intended to bloom. Silene Pendula, when sown in the autumn, makes a pleasing show of pink flowers in the spring. The roots of the herbaceous kinds may be divided in spring. The shrubby sorts are increased by cuttings planted under a hand-glass. The dwarfs make fine rock-work ornaments. Flowers are produced in June and July. Height, 2 in. to 1-1/2 ft.

Silphium Aurantiacum.—A good and hardy border perennial, which produces during July and August large deep orange-yellow flowers resembling a Sunflower. It is very useful for cutting, will grow anywhere, and can be increased by dividing the root. Height, 4 ft.

Sisyrinchium Grandifolium(Satin Flower, or Rush Lily).—A light loam suits this plant, which is moderately hardy. The soil should be moist, but not wet. It does not like being disturbed, but when necessary the crowns may be divided in autumn, taking care to spread the roots well out. It blooms in April or May. Height, 1 ft.

Skimmia.—Neat-growing, dwarf evergreen shrubs having Laurel-like leaves, and producing a profusion of scarlet berries in winter. They succeed in any ordinary soil, but thrive best in peat and loam; and are propagated by cuttings placed in heat under glass.

Slugs.—A sharp watch should be kept over all slugs, and constant visits paid to the garden at daybreak for their destruction. If fresh cabbage leaves are strewed about in the evening the slugs will congregate under them, and in the morning they may be gathered up and dropped into strong brine. The ground may also be dusted with fresh lime, which is fatal to them, but in wet weather the lime soon loses its power.

Smilax.—A greenhouse climbing plant that is admired for its foliage rather than its bloom. A mixture of peat and loam or leaf-mould and sandy loam suits it. Train the shoots up string, and freely water the plant in summer; during the autumn and winter it does not need much moisture. Keep the temperature of the house up to 60 degrees throughout the winter. It is readily increased by cuttings. It flowers in July. Fine for table decoration. Height, 4 ft.

Snails.—To prevent snails crawling up walls or fruit trees daub the ground with a thick paste of soot and train oil. There is no remedy so effectual for their destruction as hand-picking.

Snake's Head Lilies.—See "Fritillarias."

Snapdragon.—See "Antirrhinum."

Sneezewort.—See "Achillea."

Snowball Tree.—See "Viburnum."

Snowberry.—See "Symphoricarpus."

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Poa Trivalis.—A very pretty, dwarf-growing, variegated grass. Plant in a moist situation in a rich, light, loamy soil. It is increased either by seed or division.

Podocarpus.—See "Cephalotaxus."

Podolepis.—Hardy annuals bearing yellow and red and white flowers. A mixture of loam and peat is most suitable for their growth. They are easily raised from seed sown in March, and bloom from June to August. Height, 1-1/2 ft.

Podophyllum Peltatum (Duck's Foot, or May Apple).—Grown chiefly for its foliage and berries, this hardy herbaceous perennial forms a pleasing spectacle when planted in moist soil under trees; it likewise makes a splendid pot-plant. A mixture of peat and chopped sphagnum is what it likes. The pots are usually plunged in wet sand or ashes on a northern border. It is propagated by cutting the roots into pieces several inches in length, with a good bud or crown on each. During May and June the plant produces small white Dog-rose-like flowers. Height, 1 ft.

Poinsettia Pulcherrima.—A stove evergreen shrub which produces lovely crimson bracts in the winter. Plant in sandy loam, give plenty of water to the roots, and syringe the leaves frequently. In early spring cut down the branches to within three or four eyes of the old wood. These cuttings, if laid aside for a day to dry and then planted under glass, will form new plants. It flowers in April. Height, 2 ft.

Polemonium (Jacob's Ladder).—Hardy perennial border plants of an ornamental character and of the easiest culture. Any soil suits them, and they merely require sowing in the open either in spring or autumn. P. Richardsoni is most commonly met with, its blue flowers being produced in early autumn. Height, 1-1/2 ft.

Polyanthus.—Sow the seed late in autumn in well-drained boxes of light, rich mould; cover it very lightly, place under glass, and water sparingly, but give enough to keep the plants moist. The seed requires no artificial heat to germinate it. The roots should be divided each year as soon as they have flowered, and fresh soil given. The single varieties only are florists' flowers. The Polyanthus is a species of primrose, grows best in a rather shady position in a loam and peat compost, and produces its flowers in May. Height, 6 in.

Polygala Chamaesbuxus.—A hardy evergreen trailing plant requiring a peat soil in which to grow. It may be increased from seed or by division of the roots. May is the time at which it blooms. Height, 6 in.

Polygala Dalmaisiana.—This showy evergreen shrub needs a greenhouse treatment. Soil—three parts peat, one part turfy loam, and a little sand. It flowers in March. To increase it, top the shoots, which will cause it to throw out new ones. Take the new growth off when it is 3 in. long, and place it under glass in a propagating house. Height, 1 ft.

The hardy annual varieties of Polygala are obtained by seed sown in peat. These flower at midsummer. (See also "Solomon's Seal.")

Polygonatum.—These pretty herbaceous plants are quite hardy. The flowers, which are borne in May or June, are mostly white. Plants succeed best in a rich soil. They may be raised from seed, or the roots can be divided. Height, 1ft. to 3 ft.

Polygonum Brunonis (Knotweed).—This strong-growing creeping perennial plant is not particular as to soil so long as it can enjoy plenty of sunshine. The shoots root of themselves and must be kept in check, else they will choke other things. It flowers in August, after which the leaves assume beautiful autumnal tints. Height, 1 ft.

Pomegranate.—This requires a deep, loamy soil and a warm, airy situation. May be propagated by cuttings of the shrubs or the root, putting the cuttings into light, rich soil, or by layers. The double kinds of Punica, or Pomegranate, should be grafted on to the single ones. There is a dwarf kind, bearing scarlet flowers in August, which requires heat.

Poppies.—See "Papaver" and "Stylophorum."

Portulaca.—The seeds of the hardy annual species of this genus may be sown in a sheltered open spot in spring. The half-hardy annuals should be sown thinly in boxes during March and placed in gentle heat. Harden off and plant out in May, as soon as the weather permits, in a light, dry soil where it can get a good amount of sunshine. Its brilliant and striking colour admirably adapts it for small beds, edgings, or rock-work; and it will succeed in dry, hot sandy positions where scarcely any other plant would live. It flowers in June. Height, 6 in.

Potatoes.—Ground intended for Potatoes should be dug deeply in the autumn, thoroughly drained, well manured and trenched, and left rough on the surface during the winter. At the beginning of February stand the tubers on end in shallow boxes, and expose them to the light to induce the growth of short, hard, purple sprouts. Allow one sprout to each tuber or set, rubbing off the rest. They may be planted at any time from the end of February to the end of March in rows 1-1/2 to 2-1/2 ft. asunder, placing the sets 6 in. deep and from 6 to 9 in. apart. As soon as growth appears keep the ground well stirred with the hoe to prevent the growth of weeds, and when the tops are 4 to 6 in. high ridge the earth up about them. Directly flower appears, pick it off, as it retards the growth of the tubers. They should be taken up and stored in October. If short of storage room dig up every other row only, and give the remaining ridges an additional covering of earth. They keep well this way.

Potentilla.—Handsome herbaceous plants with Strawberry-like foliage. They will grow in any common soil, and may be increased by dividing the roots or by seeds treated like other hardy perennials. The shrubby kinds are well adapted for the fronts of shrubberies, and are propagated by cuttings taken in autumn and planted in a sheltered situation. They flower at midsummer. Height, 1-1/2 ft.

Potting.—Great attention must be paid to this important gardening operation. It is necessary that the pots used be perfectly clean, and, if new, soaked in water for several hours previously, otherwise they would absorb the moisture from the soil to the detriment of the roots. At the bottom of the pots place a few layers of crocks, and on these some rough mould so as to ensure perfect drainage. For all delicate, hard-wooded plants one-third of each pot should be occupied with drainage, but a depth of 1-1/2 in. is sufficient for others. Lift the plant carefully so as not to break the ball of earth round the roots, and fill in with mould round the sides. In order to supply water readily the pots must not be filled up to the rim. Pot firmly, and in the case of hard-wooded plants ram the earth down with a blunt-pointed stick; soft-wooded ones may be left rather looser. Give shade till the plants have recovered themselves. The soil used for potting should be moist, but not clammy. A rather light, rich loam is most suitable for strong-growing plants; peat for slow-growing, hard-wooded ones, like Ericas, Camellias, etc.; and a mixture of light loam, one-third its bulk of leaf-soil, and silver sand in sufficient quantity to make the whole porous for quick-growing, soft-wooded plants, such as Pelargoniums, Calceolarias, Fuchsias etc.

Pratia Repens (Lobelia Pratiana).—This pretty little creeping perennial is very suitable for the front of rock-work. It requires a well-drained vegetable soil and all the sun it can get. It is self-propagating. Though pretty hardy, it is safer to pot it off in autumn and place it in a cold frame throughout the winter. Flowers are produced in June, and are succeeded till cut off by frost.

Primroses.—See "Primulas," and "Streptocarpus."

Primulas.—This genus embraces the Auricula, the Polyanthus, and the Primrose. The greenhouse varieties are among the most useful of our winter-flowering plants. The seed may be sown at any time from March to July in a pot of two-year-old manure, leaf-mould, or fine, rich mould, but not covering it with the soil. Tie a sheet of paper over the pot and plunge it in a hotbed. Sufficient moisture will be communicated to the seed by keeping the paper damp. When the plants make their appearance remove the paper and place the pot in the shady part of the greenhouse. When they are strong enough to handle, pot off into 4-1/2 in. pots, and stand them near the glass. The roots may be divided as soon as the plants have done flowering. The hardy kinds may be sown in the open. It should be borne in mind that the seed must be new, as it soon loses its germinating properties. These flower in March or April. Height, 6 in.

Prince's Feather.—An ornamental hardy annual, producing tall spikes of dark crimson flowers and purple-tinted foliage. It is not particular as to soil, and merely requires sowing in the open in spring to produce flowers in July. Height, 2 ft.

Privet.—See "Ligustrum."

Prophet's Flower.—See "Arnebia."

Prunella Grandiflora.—A pretty hardy perennial, suitable for a front border or rock-work, bearing dense spikes of flowers from May to August. It grows well in any ordinary soil, and is propagated by division. Height, 6 in.

Pruning.—The main objects to bear in mind in Pruning any kind of bush or tree are to prevent a congested growth of the branches, to remove any shoots that cross each other, as well as all useless and dead wood, and to obtain a well-balanced head. It may be done either in August or in the winter when the sap is at rest, after the worst of the frosts are over, the end of February being usually suitable; but the former period is generally acknowledged to be the better, especially for fruit-trees. The cuts should be clean and level, and when a saw is used should be made smooth with a chisel and covered with grafting wax. In all cases as little wound as possible should be presented. Root-pruning has for its object the suppression of over-vigorous growth and the restoration of old trees to a bearing condition. It consists in taking off all the small fibres, shortening the long roots to within 6 or 8 in. of the stem, and cutting away any bruised or injured roots before the trees are first planted out. The mode of procedure in the case of old or unproductive trees is to open the earth in autumn 3 ft. from the stem of the tree, and to saw through two-thirds of the strongest roots. The opening is then filled in with fresh mould. Should the growth still be too vigorous, the soil must be opened again the following season and the remaining roots cut through, care being taken not to injure the young fibrous roots.

Prunus.—Beautiful early-flowering trees, which will grow in any soil, and can be increased by seeds or suckers.

Ptelia Trifoliata (Hop Tree).—This is very suitable for planting on the borders of still waters, where its long frond-like leaves, which turn to a golden yellow in autumn, produce a fine effect. It blooms in June, and is propagated by layers. Height, 10 ft.

Pulmonarias (Lungworts).—Hardy perennials that require but little attention; may be grown in any common soil, and propagated by division at any time. They flower in April and May. Height, 1 ft.

Pumilum.—See "Heleniums."

Pumpkins.—Valuable for soups and pies in winter, and in summer the young shoots are an excellent substitute for Asparagus. For their cultivation, see "Gourds."

Punica Granata Nana.—A greenhouse deciduous shrub which flowers in August. The soil in which it is placed should be a light, rich loam. It can be most freely multiplied by layers, and cuttings will strike in sand under glass. Height, 4 ft.

Puschkinia (Striped Squills).—This charming bulbous plant may be grown in any light, rich mould, provided it is drained well. The bulbs may be separated when the clumps get overcrowded, late in summer, after the tops have died down, being the most suitable time to do so. If planted in a warm position it will begin to flower in March, and continue in bloom till May. Height, 8 in.

Pyrethrum.—The greenhouse kinds grow in any rich soil, and young cuttings planted under glass root readily. The hardy kinds are not particular as to soil so long as it is not cold and wet, and are increased by seeds sown in heat in February if wanted for early use, or in the open during March and April for later growth. The crowns may be divided either in autumn or spring: each eye or bud will make a fresh plant. Young plants produced in this way in the autumn require the protection of a frame during the winter. They flower in July. Height varies from 6 in. to 3 ft.

Pyrola.—A handsome hardy plant, suitable for a moist, shady situation. It is raised from seed, or will bear dividing, but is rather hard to grow. Height, 6 in.

Pyrus Japonica.—See "Cydonia."

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