224 



PRACTICAL LANDSCAPE GARDENING 



Fig. 172. — A dry retaining wall with pockets for plants, where the water feature adds 

 greatly to the scene. — See page 226 



most formidable stones come at the base. In some places the at- 

 rangement should be almost perpendicular and in others flattened 

 out to a more gentle slope. In this class of work we are imitating 

 nature just as closely as possible and the boulders must be so 

 arranged as to appear inherent in the soil. 



SOIL 



An abundance of good porous soil must be used and well mixed 

 with leaf mold and well rotted manure to a depth of two or three 

 feet. It is almost impossible to establish and grow a good assort- 

 ment of rock plants on many of the so-called rockeries for the reason 

 that the pockets for soil are far too small and devoid of moisture, 

 so that only the very hardiest of drought resisting Alpines can 

 exist. 



ARR.\NGEMENT OF PLANTS 



The arrangement of the plants should be in clumps or colonies 

 of one variety, and not of a mixed planting where the strongest grow- 



