230 ROCK GARDENING FOR AMATEURS 



soil in full sun. Hypericums may also be increased by 

 means of cuttings, inserted in sandy soil, in a close frame, 

 in summer. 



Iberis (Perennial Candytuft) The Evergreen Candy- 

 tufts rank high among the rock-garden flowers that are 

 easily grown. They are of half-shrubby growth, and in 

 April and May become smothered in bloom. They are 

 native chiefly of Southern Europe, and belong to the 

 Wallflower family (Cruciferae). Ordinary well-drained 

 soil suits them, and they never look better than when 

 planted above some rock ledge so that the growth may 

 hang over its face. The best are Iberis sempervirens 

 and its variety garrexiana, white ; gibraltarica, white 

 tinged with lilac ; correaefolia, having larger flowers, 

 white. They are easily raised from seed sown in spring 

 or summer. 



Jasione (Sheep's Scabious). Useful rock plants, be- 

 longing to the Bellflower family (Campanulaceae). The 

 flowers are blue, in rounded heads. They are easily 

 grown in sandy soil in a sunny place. J. perennis, nine 

 to twelve inches high, is attractive for bold rockwork ; 

 but a newer one is J. Jankae, which is dwarf er, giving 

 deep blue globular flowers from tufts of narrow leaves 

 in summer. Increased by division immediately after 

 flowering, or by seeds, when these can be obtained. 



Leontopodium (Edelweiss). Owing to the legend 

 that Edelweiss grows only on inaccessible rocks, it seems 

 to have gained a reputation for being difficult to grow, 

 though it is really easy if planted firmly in well-drained 



