Arum. Aroideæ.
Propagated by seeds, but usually by division of the roots, the best time being just as they begin their new growth, securing as many roots as possible to each division. Any rootless pieces should be placed in heat shortly after removal; this hastens the formation of roots and excites top growth. Arisæmas are treated in the same way.
Arundinaria. Gramineæ.
Increased by division of the root.
Arundo (Reed). Gramineæ.
Propagated by seeds or divisions, spring being the best time for either method. In early autumn, the canes can be cut into lengths of 18 to 24 inches and partly buried in sand in a gentle bottom heat, laying them horizontally.
Asarum. Aristolochiaceæ.
Propagated easily by divisions in spring.
Ascaricida. See [Vernonia].
Ascium. See [Norantea].