38 The Landscape Gardening Book 



poplar; sixty feet high; any soil; rapid growing; effective 

 when used after the manner of the old world cypress. 



Columnar — Trained Artificial Forms 



evergreen 



1 — Buxus sempervirens: boxwood; three to five feet high; grows 



slowly and therefore does not require much shearing. 

 2 — Tsuga Canadensis: hemlock; may be kept at any height; 

 shear in the same manner as when used for a hedge. 



DECIDUOUS 



I — Ligustrum: privet; from three to seven feet high; retains its 

 leaves during winter, so is actually half evergreen ; shear the 

 same as when used for a hedge. 



Pyramidal — Natural Forms 

 evergreen 



I — Thuya occidentalis, Sibirica: Siberian arborvitae; to thirty 

 feet high, of slow growth ; loamy soil ; broad at base and 

 tapering ; dense ; brighter green than other arborvitass. 



2 — Retinospora pisifera, plumosa {Chamcscyparis pisifera, plu- 

 mosa): Japanese or Sawara cypress; three to eight feet 

 high and same width at base ; moist but well drained sandy 

 loam, partly shaded, and sheltered from drying winds. 



2 — Retinospora ptsijera, squarrosa (C. pisifera, squarrosa) : blue 

 Japanese cypress; same as above; foliage silvery-blue, dense, 

 feathery. 



There are no deciduous natural pyramidal forms. Pyramidal 

 trained artificial forms, both evergreen and deciduous, may be 

 had in the same varieties as the Columnar forms. 



