ROCK GARDEN PLANTS 39 



flower racemes hang in great profusion. Campanulas 

 are so charming that in their case we cannot well have 

 too many species. 



Cerastium. Mouse-ear Chickweed. Dwarf, silver- 

 leaved Alpines, bearing numerous white flowers from 

 May to July. The variety Biebersteini is easily grown 

 and is one of the best. 



Chetranthus. Wallflower. For rock garden grouping, 

 the bright orange variety Marshalli is the finest. The 

 Alpine Wallflower (C. alpinus, syn. Erysimum ochro- 

 leucum) is valuable for the joints of rock walling. The 

 perennial Wallflowers thrive in poor soil and a dry 

 position in winter. Cuttings. 



Colchicum. Meadow Saffron. Drifts of the rosy 

 flowered C. autumnale look exquisite in the grassy 

 approaches to the rock garden. The leaves die down 

 before the blossoms appear, hence the necessity for a 

 carpeting of grass or dwarf Alpines. They are easily 

 grown, increase freely and brighten the garden at a time 

 when flowers are scarce. 



Coronilla. Scorpion Senna. Though little grown, this 

 is a desirable plant. C. iberica forms dense tufts of 

 trailing foliage, which in June become studded with 

 vivid yellow blossoms. C. varia, with pink and white 

 flowers, is also good. A fair depth of soil is essential. 



Dianthus. Pink. This large family includes several 

 species of value. The Cheddar Pink (D. csesius) thrives 

 in gritty crevices between adjacent rocks. On rich soil 

 it soon dies. D. deltoides (Maiden Pink), a charming 

 pink spotted variety, is of particularly easy culture. 

 The Glacier Pink (D. neglectus) thrives in sandy loam, 

 its dwarf tufts of foliage and myriad rosy flowers 

 producing a charming eflFect on the higher ledges. 



Dodecatheon. American Cowslip. These plants should 

 be grown in similar positions to the Alpine Primulas, the 

 roots being divided from time to time and replanted in 



