Silene (Campion, Catchfly). Caryophylleæ.
Propagation is effected by seeds, by divisions, and by cuttings.
Silk-Cotton Tree. See [Bombax].
Silphium (Rosin-plant, Compass-plant). Compositæ.
Propagated by seed and by divisions.
Silver Bell. See [Halesia].
Sisyrinchium (Blue-eyed Grass, Pig Root, Rush Lily, Satin Flower). Irideæ.
It may be increased in spring by seeds or by divisions.
Skimmia. Rutaceæ.
Seeds, in a frame. Also by layers and by firm cuttings in gentle heat.