30 College of Forestry 



walks (balanced or unbalanced form), and this being the one 

 in most common use we may call it the standard or normal 

 type. Two distinct effects may be secured in this form of 

 planting depending on the nature of the trees used ■ — 

 whether the trees are (a) of broad spreading habit or (b) 

 of upright pyramidal or columnar habit. 



In the one case we get an over-arching effect such as is 

 seen in so many streets which contain old American elms. 

 With trees of the upright form such as is found in the 

 younger stages of growth with practically all trees, or with 

 mature trees such as the pin oak or gingko, we get the effect 

 of a framed-in vista especially pleasing when an interesting 

 building, monument or view terminates the vista. 



The over-arching form, while beautiful in itself, is seldom 

 satisfactory save on streets with very wide grass parkings 

 which will meet the conditions of growth which the roots of 

 large trees demand. It is the absence of such parkings that 

 is causing the rapid passing of the American elm as a street 

 tree in New York City. 



In street planting of the normal type the trees may be 

 grown in several ways, depending upon the design, width 

 and traffic conditions of the street in question. 



(A) In grass or gravel parkings.* 



(B) In fenced parking areas or large tree pits. 



(C) In small tree pits with gravel surface or with iron 

 grating or other form of surface cover. 



(D) In a continuous strip, between sidewalk and curb, 

 which is paved with bricks laid in sand. 



This type of planting is adapted for use on residential or 

 secondary business streets which have wide sidewalks and 



""' In the case of grass parkings, where the parkings are sufficiently 

 wide, shrubs may he planted in rows or clumps between the trees. Very 

 beautiful effects may be secured by using a single variety of shrub on 

 a street in combination with a single variety of tree. Thus great in- 

 dividuality may be given to different streets and yet use only the normal 

 type of planting design. The city of Sacramento, Cal., has adopted a 

 street planting program along this line and the writer assisted some 

 years ago in making the selection of trees and shrubs for the first 

 street so treated. 



