134 THE COMPLETE GARDEN 



Prunus pissardi Sorbus quercifolia 



Purple-leaved Plum Oak-leaved Mountain Ash 



Pyrus (in variety) Taxodium distichum 



Crab Bald Cypress 



Quercus (in variety) Tilia tomentosa 



Oak Silver Linden 



Salix blanda Thuja (in variety) 



Wisconsin Weeping Willow Arborvitae 



Salix vitellina britzensis Tsuga canadensis (in variety) 



Hybrid Yellow Willow Canadian Hemlock 



Sciadopitys verticillata Ulmus foliacea wheatleyi 



Umbrella Pine Wheatley's Cornish Elm 



Ulmus glabra camperdowni 

 Camperdown Weeping Elm 



b. Columnar and pyramidal trees: 



Oftentimes situations arise in the solution of landscape problems 

 where the use of trees for their pyramidal or columnar habit of growth 

 becomes almost a necessity. This necessity may arise because of such 

 features being an important part of the landscape composition, or it 

 may arise because of the screen effect which the designer is desirous 

 of producing where trees must develop within a narrow space of from 

 two to four feet. Most of the trees in this group develop normally into 

 a pyramidal or columnar form like the pyramidal maples, the poplars, 

 and the red cedar, quite unlike the spreading habit of the sugar maples, 

 horse-chestnut, and beech. None of these trees lend themselves to use 

 in plantations where a broad, informal character is desired in the 

 picture; but all lend themselves for use in landscape planting where it is 

 necessary to have a background of heavy foliage and an immediate 

 garden planting close to these trees. The planter should always 

 bear in mind that a background of trees of this type, planted closely 

 together, will be very injurious to a flower garden development, 

 provided the screen planting is located on the southerly side of the 

 flower garden, thus throwing dense shade over the garden during the 

 greater part of the day. From another point of view, however, this 

 type of tree planted closely together will prove a wonderful asset if 

 planted on the southerly side of some fountain or garden terminus 

 where it is desired to produce a heavy shade. 



Abies brachyphylla Acer Saccharinum pyramidale 



Nikko Fir Pyramidal Silver Maple 



Abies concolor Acer saccharum monumentale 



White Fir Pyramidal Sugar Maple 



