154 



THE PRINCIPLES OF PRUNING 



* a. 



ticularly of the Kieffer type, make very long and 

 erect growths, but when bearing -time arrives the 

 growth is less marked and the limbs spread. The 

 treatment of a young tree, therefore, may be very 

 different from that demanded by the same tree 

 when it arrives at maturity. 



6. One part of a plant may 

 live at the expense of 

 another part. 



We know that the plant 

 cannot make use of the ma- 

 n T terials taken in by the roots 

 and leaves until these ma- 

 terials have been elaborated 

 in the green parts. The elab- 

 orated material is distributed 

 to every living and growing 

 point. Some of this mate- 

 rial is stored, particularly in 

 the fall, and from this stored 

 material the early bloom and 

 growth of spring is partly 

 and sometimes largely made. Strong spring 

 shoots are supplied from other parts of the plant 

 as well as from newly appropriated materials. 

 On this point Sorauer writes* that "it must not 

 be forgotten that at the commencement every 



115. Renewal of the 

 leader on the root. 



*" Physiology of Plants for the Use of Gardeners," translated by 

 Weiss, 146. 



