Hippophaë (Sallow Thorn, Sea Buckthorn). Elæagnaceæ.
May be increased by seeds, suckers, layers, and cuttings of the roots.
Hoffmannia, Higginsia. Rubiaceæ.
Insert cuttings in sandy soil under cover, in bottom heat.
Hog Plum. See [Spondias].
Holbœllia. Berberideæ.
In spring, cuttings may be made of half-ripened shoots.
Holly. See [Ilex].
Hollyhock (Althæa). Malvaceæ.
Seeds should be sown as soon as ripe—in summer—in pots or pans, and placed in a slight bottom heat or in the open air. In either case, place the seedlings in 3-inch pots, and winter in a cold-frame. Dividing the roots, after flowering is over, by separating the crown, so as to preserve one or more buds and as many roots as possible to each piece. Cuttings of young shoots three inches long, taken off close to the old root at nearly the same time, should be placed singly in small pots of light, sandy soil and kept close, and shaded in a cold-frame until rooted. If cuttings are made during winter, a gentle bottom heat must be given. Also grafted (see page 88). See also [Althæ]a.