THE NURSERY LIST. 205 



Hovenia. Rhamnece. 



Increased by seeds. Root cuttings are also used. Ripened 

 cuttings should be placed in sand, under a hand-glass. 



Hoya (Honey Plant, Wax Flower). Asclepiadecc. 



For layering, good-sized shoots should have a few of their 

 leaves removed, and should then be put in pots of soil until 

 rooted. The plants may rfterwards be grown on, and re- 

 potted according to their strength. Cuttings may be taken 

 in spring or later in the year, from shoots of the preceding 

 summer's growth, and placed in a compost of peat and sand, 

 and plunged in bottom heat in a frame. A slight shade and 

 careful watering will be necessary. //. bella does best when 

 grafted on a stronger growing sort. 



Huckleberry. See Vaccinium. 



Kumea, Agathomeris, Calomeria. Composite. 



Sow seeds in light, finely-sifted soil, and place in a frame 

 in early summer. 



Humulus (Hop). Urticacecc. 



It may be propagated by seeds, or by divisions in spring. 

 Ordinarily, however, the species is increased by hard-wood 

 cuttings of two-bud lengths from the best old shoots, and 

 made in spring. Leave the top bud just above the ground. 



Hyacinthus (Hyacinth). Liliacece. 



Seeds are employed for the production of new varieties. 

 These are sown the same season they mature, in light, sandy 

 soil, and are covered not more than a half-inch deep. In 

 four or five years, or sometimes even longer, the bulbs will 

 be large enough to flower. Varieties are perpetuated by 

 means of the bulbels which form freely upon some varieties. 

 These are treated in much the same manner as mature bulbs, 

 or they may be handled in pans or flats. They make flower 

 bulbs in two or three years. To increase the numbers of 

 these bulbels, the bulbs are variously cut by the Dutch grow- 

 ers. These practices are described and illustrated on pages 

 27 and 28, Figs. 12-14. Hyacinths can be propagated by 

 leaf cuttings. Strong leaves should be taken in early spring 

 and cut into two or three portions, each portion being insert- 

 ed about an inch in good sandy loam, and given a tempera- 

 ture of about 75. In eight or ten weeks a bulblet will form 

 at the base of the cutting (see page 52). The lower leaves 

 give better results than the upper ones. Tne^e bulblets are 

 then treated in the same manner as bulbels. 



