WHAT TO GROW IN ROCK-GARDENS 99 



and will do in any open position. It should be planted 

 away from all choice things, for it spreads by root and 

 stem, and should be cut back several inches after it has 

 finished flowering and in the autumn. It can be propagated 

 by cuttings. Used for covering large stones or slopes in 

 the rock-garden it looks wonderfully well, and is a mass 

 of white flowers in June and July. The two best varieties 

 for amateurs are C. Biebersteini and C. Tomentosum. 

 Both average about 6 ins. in height, and are white. 



Cheiranthus alpinus : This is a delightful little trailing 

 plant which thrives in any well drained soil. Plant so that 

 it can fall over stone. It blooms freely, giving remarkably 

 pretty yellow flowers in May and June. Height 6 ins. 



Convallaria majalis (Lily of the Valley) : Quite a useful 

 rock-plant. A semi-shady position suits it best, and it 

 thrives on a gentle slope. Plenty of leaf-mould is advisable. 

 Height 6-12 ins., it flowers in June. 



Crucianella stylosa : Will thrive in most positions. The 

 soil should be dry and contain chalk or lime. The flowers 

 are rose-coloured, and given freely most of the summer. 

 Height about 6 ins. It spreads rapidly when once 

 established, so it should not be set near choice plants. 



Cyclamen : Many people imagine that hardy Cycla- 

 mens are difficult to grow, but really there is no difficulty. 

 They need a light soil with plenty of leaf-mould added, 

 and a warm sheltered position. Spring planting is advis- 

 able. 



Good Varieties. 

 Cyclamen 



Atkinsii rubrum (rose), April-May . . 6 ins. 

 ibericum (crimson), Feb.-April . . 3 ins. 



repandum (red), April-May . . . . 4 ins. 



Dianthus : Any of the countless varieties described 

 in trade catalogues can be tried in the rock-garden. They 

 do well if given ordinary positions and light soils. Two 

 good ones to begin with are D. alpinus (6 ins., rosy-red, 

 May-July), and D. neglectus (6 ins., bright rose, May- 

 July). 



