392 FRITZ BAHR'S COMMERCIAL FLORICULTURE 



yellow and brown; H. Hoopesii, which starts to produce its large 

 yellow blossoms in July; and H. autumnale superbum rubrum, of a 

 deep blood red color. 



Heleniums are best propagated by root division as soon as the 

 flowers have gone and it is always well to plant a few in a frame 

 where you can protect them in case something happens to those 

 out in the open. 



HELIANTHEMUM (ROCK ROSE) 



The Helianthemums, of which there are a number of named 

 varieties, are not of much value to the florist as cut flower plants, 

 but they do come in handy as hardy border plants. They can be 

 used to advantage in rock gardening as they thrive in the hottest, 

 driest spots and hardly ever grow over ten to twelve inches. They 

 come in a great assortment of shades from pure white to a red and 

 their flowering period extends over several months. During July 

 most of them are completely covered with blossoms. Also the plants 

 are evergreen and grow easily from seed, or can be divided. Sud- 

 berry Gem is a fine buff-colored sort; Rosy Gem is pink, and 

 H. aureum, yellow; a good double red is Mrs. Earle. 



HELIANTHUS (SUNFLOWER) 



What interests us most among the different forms of Heli- 

 anthus are the hardy varieties of which there are a half-dozen or 



Fig. 175. HELIANTHUS. In September and October when the hardy border begins 



to thin out, this hardy single Sunflower is at its best. One plant once established 



will soon grow into a huge, attractive mass 



