STREET TREES. 9 



How to keep trees healthy. 'Any tree will resist insects and dis- 

 ease, and will recover from injury much more readily if it is vig- 

 orous and healthy than if it is weak. Observe the following rules : 

 Never let a sidewalk be laid closely about a tree ; a surface of bare 

 earth (footing) at least 2 by 3 feet, preferably 4 by 8 feet, should 

 be kept (figs. 2, 3, 5) ; when a tree is fully established this may be 

 grassed over, tho it is advisable to keep it open. Once a year work 

 a little fertilizer into this open space and water it at intervals as di- 

 rected at page 13. 



Fig. 4. A Young Street Tree. Fail- 

 ing Thru Lack of Care Of Poor 

 Form, with Branches too Low, It 

 is Crowded in a Brick Pavement, 

 Has no Stake and Only a Short, 

 Frail Guard. 



Fig. 5. A Young Street Tree of 

 Good Form, Properly Planted and 

 Well Cared For Guard, Stake, 

 Footing as They Should Be. 



If a young tree is exposed to winds or other strain, keep it firm 

 and upright by means of a stout stake to which the stem is secured 

 in such fashion that it will not be rubbed (fig. 5). Unless the tree 

 is so placed that it cannot be gnawed by horses maintain a stout 



