354 THE NURSERY LIST. 



Hollyhock (Althaea). Malvaceee. 



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 coldframe. Dividing the roots, after 

 flowering is over, by separating the crown, so as to pre- 

 serve one or more buds and as many roots as possible to 

 each piece. Cuttings of young shoots 3 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 coldframe until rooted. 

 If cuttings are made during winter, a gentle bottom heat 

 must be given. Also grafted (see page 129). See also 

 Althaea.. 



Honesty. See Lunaria. 



Honey Locust. See Gleditschia. 



Honeysuckle. See Lonicera. 



Hop. See Humulus. 



Hop Hornbeam. See Ostrya. 



Horehound {Marrubium vulgare). Labiates. 



Seeds, in early spring. Division. 

 Horkelia. See Potentilla. 

 Hornbeam. See Carpinus. 

 Horse-Chestnut. See .^sculus. 



Horse-Sadish {Nasturtiutn Armoracia). Cruciferee . 



Root cuttings ("sets"). These are made from the 

 small side roots when the horse-radish is dug. They may 

 be anywhere from one-fourth to one inch in diameter, and 

 3 to 6 inches long, one end being cut slanting, to mark it. 

 These are planted obliquely, 2 to 4 inches deep, in spring. 

 They may be buried during winter. (Fig. 64.) The old 

 crowns may be planted, but they make poorer roots. 



Hottonia PrimulacecE. 



Propagation is effected by seeds, and divisions in spring. 



House-Leek. See Sempervivum. 



House Plants. The common conservatory plants, like 

 fuchsias, geraniums, carnations, and the like, give best 

 results when allowed to bloom but one year. They are 



