THE NURSERY-LIST 335 



and covered with sand to encourage the formation of such shoots. 

 Sometimes the roots of strong fresh plants are divided after flower- 

 ing, each eye carrying with it a good set of roots. 



Holodiscus (sometimes included in Spiraea). Rosacece. 



Propagated by seeds usually sown in fall in boxes, slightly covered 

 with soil or on a slight top layer of moss where they require no 

 covering ; by layers ; or sometimes by greenwood cuttings under 

 glass taken with a heel. 



Hop (Humulus). Moracece. 



The annual ornamental Japanese hop is grown readily and 

 freely from seeds, often self-sowing. The common field hop 

 (Humulus Lupulus), which is perennial, is propagated by cuttings 

 of the underground stems, which are taken in spring, 4 to 8 inches 

 long and with two to six eyes, and usually set two to four together 

 in hills directly where the crop is to grow ; sometimes the cuttings 

 are heeled in on a moist place till planting time arrives. 



Horse-Radish (Roripa Armor acia; formerly Nasturtium Armora- 



cia). Cruciferoe. 



Root-cuttings (" sets ") are made from the small side roots when 

 the horse-radish is dug. They may be anywhere from ^ to 1 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 in winter. The old crowns may be 

 planted, but they make poorer roots. Fig. 105. 



Hosta, also known as Funkia (Plantain Lily). Liliacea. 



Propagated by seeds sown when ripe ; blooming plants should be 

 had in one to three years. Usually by dividing the clumps in spring. 



Hottonia. Primulacecs. 



Propagated by seeds, and by division in spring. 



House Plants. 



The common conservatory plants, as fuchsias, geraniums, car- 

 nations, give best results when allowed to bloom but one year. 

 They are then thrown away and their places supplied by other 

 plants ; or the old stocks may be cut back, if still vigorous, so that 

 cuttings may be made from the new shoots that arise. Cuttings 

 are generally made in late winter or spring for the next winter's 



