Hemerocallis (Day Lily). Liliaceæ.
Increased by divisions. H. Middendorfii and some others by seed.
Hemlock Spruce. See [Tsuga].
Hemp. See [Cannabis].
Hepatica. Ranunculaceæ.
Can be propagated by division; also by seeds.
Heracleum (Cow Parsley, Cow Parsnip). Umbelliferæ.
Readily increased by seeds or divisions.
Herbertia. Irideæ.
Propagated by means of seeds or bulbels.