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 flavouring 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.