WHAT TO GROW IN ROCK-GARDENS 101 



Good Varieties. 

 Gentiana 



acaulis (deep blue), March- June . . 6 ins. 

 verna (blue), April-May 3 ins. 



Geranium (Crane's Bill) : This is quite distinct from 

 the geraniums or pelargoniums used for bedding out. It 

 does well in a partially shaded position, but will also do 

 splendidly in a sunny site in the rock-garden. Ordinary 

 good soil suits it. Plant November or March. 



Good Varieties. 

 Geranium 



argenteum (bluish-pink), May- July . . 6 ins. 

 cinerum (purple-red), May-Sept. . . 6 ins. 



sanguineum (rich crimson), June-Aug. 9 ins. 



Gnaphalium leontopodium (Edelweiss) : This is the 

 Edelweiss of the Swiss Mountain. It is not easy to grow 

 in England. It is best planted in very sandy soil in March. 

 Height 3 ins. ; white flowers produced in June and July. 



Helianthemum (Sun Rose) : Can be used as an edging 

 to the perennial border, as well as for the rock-garden. 

 In the rock-garden it is best to plant it where it can fall 

 over the stones ; and it must be cut back after flowering 

 to keep it neat. After a few years it gets very straggly, 

 so that new stock should be obtained. This can be done 

 by propagating by seeds in the spring ; and by cuttings 

 in the late summer. There are numerous named sorts 

 originating from the type H. vulgare, including a colour 

 range of orange, red, rose, pink, yellow. Most of them 

 are 4-12 ins. high, and flower continuously during the 

 summer months. They are wonderfully bright plants for 

 the rock-garden, and a dry sunny position suits them best. 



Hepatica : There are a number of beautiful forms of 

 this plant which are all worthy of a place in large rock- 

 gardens. Perhaps the best to begin with are H. triloba, 

 (4 ins., blue, Feb.-May) and H, angulosa (6 ins., blue, 

 Feb.-April). Their culture is easy, similar to that of the 

 Anemone described in this chapter. 



Hypericum (St. John's Wort, Rose of Sharon) : Quite 



