SELECTING SHADE TREES 



19 



40 feet apart in poor soil to 50 feet in the 

 more favorable sites. 



Norway Maple. Very hardy, adapted 

 to a variety of soils, has a regular com- 

 pact crown, casts dense shade, requires 

 little pruning. Plant 35 to 40 feet 

 apart. 



Red Oak, Pin Oak, Scarlet Oak. Best 

 oaks for street purposes ; hardy, medium 

 growth, moderate shade, fairly free from 

 insects, should be spaced 40 to 50 feet 

 apart. Red Oak is the fastest growing 

 oak, has a wide-spreading crown, and is 

 least fastidious in regard to soil and 

 moisture. Scarlet oak has brilliant and 

 persistent foliage in Autumn. Pin oak 

 has a rather narrow, pyramidal head, 

 and is best adapted to moist soil. It 

 grows slowly at first but makes a good 

 growth when well established. Oaks do 

 not stand pruning well, and branches 

 should be cut off at the trunk. Because 

 pin oak branches droop more than other 

 oaks, the branches must be pruned off 

 far up the trunk to prevent interference 

 with street traffic. 



Gingko or Maidenhair Tree. Hardy, 

 adapted to poor soils, casts light shade, 

 free from enemies of all kinds. Suited 

 to narrow streets, but the head can be 

 broadened by proper pruning. The 

 fruit is objectionable, but only for a 

 short time. Spacing about 30 feet. 



Honey Locust. Stands smoke well, 

 adapted to almost any soil. Casts very 

 light shade, good growth, fairly free from 

 enemies. Should be planted sparingly. 

 Spacing about 40 feet. 



Ailanthus. Young trees vigorous, of 

 good appearance, but later become 

 unsightly. Adapted to the most ad- 

 verse conditions . Thrives in very smoky 

 atmosphere and in poor soil. Male tree 

 has obnoxious odor, so only female form 

 should be planted. Sprouts freely from 

 roots, but these can be controlled by 

 cutting back. Should not be considered 

 where other trees will grow. Spacing 

 about 30 feet. 



STREET TREES FOR PLANTING 

 UNDER FAVORABLE CONDITIONS 



American Elm. A graceful tree, at- 

 tractive in summer and winter. Tall 

 and stately with strong arching 

 branches. Grows rapidly in rich, well- 

 drained, moist soil, but adapted to many 



soils. Should be planted only on wide 

 avenues, 40 to 60 feet apart, according 

 to soil conditions, usually about 50 feet. 

 Very liable to attack by the elm leaf 

 beetle. The English elm is smaller, 

 more compact, not as graceful as the 

 American elm, and more subject to 

 insect attack. 



Sugar Maple. Very hardy but exact- 

 ing in soil and moisture, and is sensitive 

 to dust and smoke. Rounded sym- 

 metrical head, foliage colors brilliantly 

 in autumn. Plant 40 to 45 feet apart. 



European Linden. Well formed, 

 rounded head, with dense beautiful foli- 

 age, grows quite rapidly but requires 

 good moist soil, and is very liable to 

 insect attack. Should be spaced about 

 35 feet. The basswood or American 

 Linden has larger leaves and is less 

 valuable for street planting than the 

 European species. 



Tulip Tree. Tall, very regular form, 

 requires good soil. Hard to transplant 

 on account of tender roots; best results 

 if young trees are planted. Subject to 

 scale and other enemies. On account of 

 its great size, should be planted only on 

 very wide streets and in suburban 

 sections. Spacing 45 to 60 feet. 



Red Maple. Adapted to good moist 

 soil, moderate growth, dense shade, 

 fairly free from insects. Fine coloring 

 in spring and fall. Space trees 35 to 40 

 feet apart. 



Sweet Gum. Best suited to very 

 moist, rich soil. Has compact form, 

 beautiful foliage, especially in fall. 

 Very free from insects. Spacing about 

 35 feet. 



White Ash. Fairly rapid growth, 

 hardy, suited to many soils. Grows 

 straight and forms a round, symmetrical 

 top. Leaves compound, and foliage in 

 pleasing, irregular masses. Few ene- 

 mies. Spacing about 40 feet. 



Hackberry. Medium sized, symmet- 

 rical tree, not exacting as to soil, mois- 

 ture, or climate. Slow growth, but 

 fairly free from pests and diseases. 

 Spacing about 30 feet. 



OBJECTIONABLE SPECIES FOR 

 STREET PLANTING 



,4// Poplars (Cottonwood, Carolina 

 poplar, white poplar, Lombardy poplar, 

 etc.). Very rapid growth and require 



