328 



Plant Physiology 



canes, but the bunches of fruit will be small and poorly 

 filled. 



Pruning at the time of transplanting is invariably 

 necessary in order to keep the balance between root and 

 shoot. Resetting or transplanting may result not only 

 in injury to the roots, but often in the death of all rootlets ; 



FIG. 84. The healing of wounds, after cutting off a lateral branch ; first 

 formation of callus (cl), after which three seasons (rings) of growth 

 were required. [After Curtis.] 



and while the latter are being developed the leaf surface 

 must be reduced. 



Ordinarily, pruning is a late winter practice, and this is 

 desirable, in the first place, because there is no injury 

 from bleeding, and secondly, on account of the prompt 

 covering of wounds by growth in the spring. For the latter 

 reason, also, branches are cut close to the main branch or 

 stem, where practicable, and no large stubs are left. 



The covering or healing of wounds by the growth of 

 tissues beginning about the margin of the wound is a 



