16 



ILLINOIS NATURAL HISTORY SURVEY CIRCULAR 51 



merged in water for long periods of time and suffocate because 

 of lack of air. A tree that was killed because of inadequate 

 drainage is illustrated in Fig. 12. On the other hand, trees planted 

 in sandy soil must be supplied with adequate water or the roots 

 will die from lack of moisture. 



Trees should be planted far enough from buildings and 

 other obstacles to allow for adequate sunshine, rain, air circula- 

 tion, and room for normal growth and spread of branches. Trees 

 planted too close to buildings grow lopsided and crowd the 

 buildings (Fig. 13), frequently resulting in damage to both 

 trees and buildings. 



Fiff. 12.— Death of 

 the red oak shown in 

 this picture followed 

 root suflfocation caused 

 by lack of soil drainage. 

 The leaves turned 

 brown and died before 

 they were fully devel- 

 oped. 



