256 ROCK GARDENING FOR AMATEURS 



from the woods of North America ; in April the succulent 

 stem rises to a height of some six inches, the leaves, in 

 a whorl of three, subsequently opening to expose one 

 exquisite, white, three-petalled bloom. The variety 

 roseum is also very attractive, the flowers being suffused 



with pinkish 

 rose. Other 

 Wood Lilies not 

 so commonly 

 grown are T. 

 erectum, and 

 T. sessile, dark 

 purple. A soil 

 made up of 

 sandy peat and 

 a shady border 

 fulfil the needs 

 of the Wood 

 Lilies, which are 

 then quite easy 

 to grow. Pro- 

 pagation may be effected by division when the stems 

 have died down. 



Tropaeolum (Nasturtium). Everyone is familiar with 

 the common climbing Tropaeolums so largely used in 

 gardens; these, of course, are not to be thought of for 

 the rock garden. But there are one or two perennial 

 kinds of value for the purpose in view. The Tropaeolums 

 are native of South America, and belong to the Geranium 



Wood Lily (Trillium). 



