Increased by seeds, and by divisions. The biennial species must be raised from seeds every year.
Alum Root. See [Heuchera].
Alyssum, including Psilonema, Ptilotrichum, Schivereckia (Madwort). Cruciferæ.
Increased by seed sown in the open border or in pans of sandy soil. By divisions. By layers. By cuttings made from young shoots two to three inches in length, placed in sandy loam, early in the season, in a shady place.
Amaranthus. Amarantaceæ.
Propagated by seeds sown in hot-beds in spring, and thinned out when about one-half inch high. About the end of May, they can be transplanted out-doors in their permanent situation, or into pots.
Propagated by seeds and offsets. Seedlings will bloom in from one to two years.
Amber Tree. See [Anthospermum].