Hæmodorum (Australian Blood-root). Hæmodoraceæ.
Increased by dividing the roots in spring.
Hakea, Conchium. Proteaceæ.
Well-ripened cuttings, placed in sandy peat under glass, in a cool house. Seeds, when obtainable, can be used.
Halesia, Pterostyrax (Silver-bell or Snowdrop Tree). Styracaceæ.
Seeds, which rarely germinate till the second year. They should be kept constantly moist. Propagation is also effected by layers, or by cuttings of the roots in spring and autumn. Layers are commonly employed in this country.
Halimodendron (Salt-tree). Leguminosæ.
Freely increased by seeds, layers or cuttings. May also be grafted on common laburnum.
Hamamelis (Witch-hazel). Hamamelideæ.
All grow from seeds or layers, and the Japan species succeed if grafted on American species in the greenhouse. H. Virginica may be readily propagated by layers.