154 THE PRINCIPLES OP PRUNING 



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- 

 -TT 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 

 us. Renewal of the material the early bloom and 



leader on the root. growtll Q f 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 



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

 Weiss, 146. 



