Propagated by seeds, which may be sown in spring or in autumn.
Broccoli. See [Cabbage].
Brodiæa, Hookera. Liliaceæ.
Increased by offsets, which should be left undisturbed with the parent bulbs till they reach a flowering state, when they may be divided and planted in autumn.
Bromelia. Bromeliaceæ.
Some are propagated by seeds. All by cuttings inserted in sand, in heat.
Bromus. Gramineæ.
Increased by seeds sown outside in late summer or in spring, thinning out when necessary.
Brongniartia. Leguminosæ.
Increased by cuttings of the young shoots, which, if firm at the base, will root in sand under a bell-glass, in a cool house.