252 THE NURSERY LIST. 



struck in late winter from stocks which are in a vigorous 

 condition. 



Helipterum, including Rhodanthe. Composites. 



Seeds may be sown in early spring, under cover. 



Helleborus (Black Hellebore, Christmas Rose). Ranuncu- 



lacecz. 



Seeds may be sown as soon as ripe. Strong and 

 healthy root divisions are also employed. See, also, 

 Veratrum. 



Helonias. Liliacecz. 



Propagation is effected by seeds, and slowly by root 

 divisions. 



Hemerocallis (Day Lily). Liliacecz. 



Increased by divisions. H. Middendorfii and some 

 others by seeds. 



Hemlock Spruce ( Tsuga Canadensis] . Conifers. 



Seeds. Named varieties top-worked on seedlings. 

 Handled the same as Abies and Picea, which see. 



Hemp. See Cannabis. 

 Hepatica. Ranunculacecz. 



Can be propagated by division ; also by seeds. 



Heracleum (Cow Parsley, Cow Parsnip). Umbellifercz. 



Readily increased by seeds or divisions. 

 Herbert ia. Iridacece. 



Propagated by means of seeds or bulbels. 



Hesperis (Dame's Violet, Rocket). Crucifercz. 



The single sorts are increased by seeds ; the double 

 forms by carefully dividing the roots, or by cuttings. 



Heuchera (Alum Root). Saxifragace&. 



Seeds. Readily increased by dividing the crowns dur- 

 ing spring. 



Hibiscus. Malvacece. 



Seeds. Also by divisions and layers. Cuttings ot 

 green wood are commonly used, made in summer for 

 hardy species or in early spring for tender ones. Cutting^ 

 of ripened wood may be taken in fall, and stored until 



