204 THE NURSERY-BOOK. 



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 Althsea. 



Honesty. See Lunaria. 



Honey-Locust. See Gleditschia. 



Honeysuckle. See Lonicera. 



Hop. See Humulus. 



Hop Hornbeam. See Ostrya. 



Horehound (Marrubiunt vulgar e}. Labiatce. 

 Seeds, in early spring. Division. 



Horkelia. See Potentilla. 



Hornbeam. See Carpinus. 



Horse-Chestnut. See ^Esculus. 



Horse-Mint. See Monarda. 



Horse-Radish {Nasturtium Armorada], Cruciferce. 



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

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

 where from one-fourth to one inch in diameter, and three to 

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

 These are planted obliquely, two to four inches deep, in 

 spring. They may be buried during winter. (Fig. 48). 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. 

 Houstonia. Rubiacece. 



Seeds. May also be increased by carefully-made divisions 

 in autumn or spring. 



Hovea, Poiretia. Leguminosce. 



Propagation is best effected by seeds, sown in well-drained 

 pots of sandy peat soil in spring, and placed in a gentle bot- 

 tom heat. Cuttings are difficult to strike. 



