322 ORNAMENTAL GARDENING. BOOK I. 



5. Bog or moss plants and shrubs are a highly beautiful class, 

 requiring a particular soil, situation, and mode of culture: 

 hence, in ornamental gardening, they ought generally to be 

 placed by themselves, particularly the more rare kinds of them, 

 as the American and Cape tribes. The soil in which these 

 commonly grow best is a sandy moss of moderate moisture; 

 the situation low and well sheltered; the exposure generally to 

 the south, though many species will thrive well under the 

 shades of other trees, or exposed to the north. This is strik- 

 ingly exemplified in the beautiful undergrowths of rhododen- 

 drons and arbutus at Kenwood and Mount Edgecumbe, also 

 in the large American plants at Zion House, Croome, and se- 

 veral other places. Exotic bog and moss plants, as ericas, 

 diosmas, Sec. ; and indeed all exotics, though kept in green- 

 houses most part of the year, should always be in a northern 

 exposure when placed in the open air, as is customary during 

 the summer months. This cool and sunless summer will make 

 their winter in the green-house, comparatively with what it 

 would otherwise be, light and agreeable. 



6. Botanic plants and trees. This division includes all those 

 not comprehended in the former. The word plants is here taken 

 in its most extensive or general sense for all vegetables, except- 

 ing trees and shrubs; consequently all of these are included 

 from mouandria to palmce. Their natural soils, situations, &c. are 



