Bur oak can be grown in pure stands, but it is often desirable to mix 

 one or two slower-growing species with it, in order to force the trees 

 to grow tall and to clear the stems of their lower branches. 



Bur oak should not be planted with trees which grow very rapidly, 

 nor where the climate is so dry that the soil needs much cultivation to 

 preserve its moisture. Care should be taken to keep the little trees 

 from being smothered by grass and weeds, to keep out stock and fire, 

 and to let the plantation acquire the character of a forest as soon as it 

 can. Weeds and litter on the ground, and shrubs that stand below 

 the crowns of the trees, are good and should not be interfered with. 



Approved. 



JAMES WILSON, 



Secretary. 

 WASHINGTON, D. G., November 24, 1906. 



[Cir. 56] 



O 



