THE CARE OF STREET-TREES 



127 



Fig. 23.— The same Oriental 

 Plane a year after the oper- 

 ation. 



producing a condition 

 known as "stag-head" 

 or "top-dry." Trees 

 can be maintained in 

 better condition by lim- 

 iting the spread of the 

 top so as to reduce the 

 draft on the roots, and 

 frequently failing speci- 

 mens can be restored to 

 vigor by shortening the 

 branches. 



Heading Back Old 

 Trees. — When early pru- 



of the branches to send more 

 energy into the portions 

 near the stem. The diam- 

 eter of the root system of a 

 tree is about the same as 

 that of the crown. On city 

 streets, where the soil is 

 usually poor and the growth 

 of the roots restricted, the 

 ends of the branches be- 

 come ragged in time, the 

 foliage thin, and finally the 

 top of the tree dies back, 



Fig. 24. —The same Oriental Plane several 

 years after the operation. 



