8 WALL AND WATER GARDENS 



a long section of wall. The character of the planting 

 might then change and gradually give way to another 

 grouping that might be mainly of Cistuses. With 

 these, and in the hottest wall-spaces, might come 

 some of the South European Campanulas ; C. iso- 

 phylla, both blue and white, C. garganica, C. fragilis, 

 and C. muralis. These gems of their kind live and 

 do well in upright walling, whereas they would perish 

 on the more open rockery, or could only be kept 

 alive by some unbeautiful device for a winter pro- 

 tection. 



Not only does the wall afford the shelter needed 

 for plants that would otherwise be scarcely hardy, 

 but the fact of planting them with the roots spread 

 horizontally, and the crown of the plant therefore 

 more or less upright instead of flat, obviates the 

 danger that besets so many tender plants, of an 

 accumulation of wet settling in the crown, then 

 freezing and causing the plant to decay. 



In many places where these rather tender southern 

 plants are grown, they have to have a covering of 

 sheets of glass in the winter, whereas in the wall 

 they are safe and have no need of these unsightly 

 contrivances. 



Some of the Plants and Shrubs for 

 Dry-Walled Terraces 



In a Cool Place 

 Saxifrages, Mossy. Corydalis. 



Wall Pennywort. Erinus alpinus (cool or warm). 



Arenaria balearica. Small Ferns. 



