46 Making a Rock Garden 



small stone wedges. The best kind is a 

 five-foot retaining wall, as there is then 



Planting plan of dry wall, the dark portions rep- 

 resenting the chief earth-filled crevices. The 

 plants are: 1 Arabis albida; <2 Alyssum saxa- 

 lile; 3 House leek (sempervivum) ; 4 Viola 

 tricolor; 5 Armeria maritima 



a good body of soil behind to which the 

 roots can reach out through the crevices. 

 But a. double-faced wall may be made, if 

 the situation demands it, by constructing 

 parallel lines of stones and filling in 

 solidly with soil. 



Although the face of the wall in either 

 case may be strictly perpendicular, it is 



