Seeds. Layers. The rooted portions of the vine may be severed and treated as independent plants. Cuttings may be made in autumn from any firm shoots, and inserted in pots or in the open ground. If they are placed in heat and kept shaded until roots are formed, good plants are obtained much sooner than when placed in a cold-frame or in the open air. Named varieties are grafted on the stock of any common strong climbing form. =Hedychium= (Indian Garland Flower). _Scitamineæ._ Seeds, rarely. Increased by dividing the rhizomes in spring, when the plants are repotted. =Hedysarum.= _Leguminosæ._ Propagation is effected by means of seeds and division. =Helenium.= _Compositæ._ Increased by seeds or divisions. =Helianthemum=, including Fumana (Rock-Rose, Sun-Rose). _Cistineæ._ The annuals are raised from seeds. The perennials may also be raised from seeds, but it is better to trust to layers and to cuttings, which will root freely in a sandy soil, if kept shaded until established. =Helianthus=, including Harpalium (Sunflower). _Compositæ._ By seeds, which may be sown in pots, and the seedlings transferred, or in the open ground in spring. Also divisions. =Helichrysum=, Elichrysum (Everlastings). _Compositæ._ The annual species and the varieties of H. bracteatum may be raised from seed, sown in a light heat in early spring, and afterwards transplanted; or sown in the open ground a little later. The perennial species are increased by cuttings in spring, in a close frame without heat. =Heliconia.= _Scitamineæ._ May be increased by seeds, but the best method is by division of the root stock in spring when growth commences. Separate pieces may be placed in pots, and grown in a moist stove temperature, repotting when necessary; or they may be planted out in the stove, if desired. =Heliotropium= (Heliotrope). _Boragineæ._ Seeds. The common practice is to use cuttings. These can be taken at almost any season, if good growing shoots are to be had. They start readily in sand or soil on a cutting bench, or under a frame. Plants for bedding are struck in late winter from stocks which are in a vigorous condition. =Helipterum=, including Astelma, Rhodanthe. _Compositæ._ Seeds may be sown in early spring, under cover. =Helleborus= (Black Hellebore, Christmas Rose). _Ranunculaceæ._ Seeds may be sown as soon as ripe. Strong and healthy root divisions are also employed. =Helonias.= _Liliaceæ._ Propagation is effected by seeds, and slowly by root divisions. =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._