184 Principles of Plant Culture. 



injury and careless handling in the treatment of plants are 

 always to be avoided. 



346. Two Methods of Propagation by Division may be 

 distinguished, viz., by parts intact and by detached parts. 

 In the first, the part selected for propagation is not 

 separated from the parent until the organs needed to 

 make it self-supporting are formed; or if a cion (386), 

 until it has united to the part on which it is intended to 

 grow. In the second method, the part intended for 

 propagation is severed from the parent at the outset and 

 placed under conditions favoring the formation of the 

 organs needed to make it self-supporting; or if a cion, 

 favoring its union with the stock (383). 



A PROPAGATION BY PARTS INTACT. 



This method is applicable to many plants and has the 

 advantages of being reliable and requiring little skill. 

 The part selected for propagation, being nourished by the 

 parent until it forms the needful organs, is able to endure 

 unfavorable conditions that would prove fatal in most 

 other methods of propagation. This method includes 

 four divisions, viz., propagation by suckers (34 7), by stolons 

 (348), by layers (349), and by approach grafting (399). In 

 the first two, the propagation is performed by the parent 

 plant without other aid than the maintenance of a well- 

 aerated, moist and clean soil that stimulates the produc- 

 tion of the needed organs, which in these cases are roots. 



347. Propagation by Suckers. Suckers are shoots that 

 originate from roots or underground stems and grow 

 upward, forming young plants about the parent, as in the 

 blackberry, plum, choke- cherry, etc. The propagation 



