CHAPTER XV 

 PROPAGATION BY GRAFTING 



A CUTTING is placed in the soil or other medium. A 

 graft or cion is placed in another plant, with the expecta- 

 tion that it will grow there. 



383. Grafting consists in placing together two portions 

 of a plant or of different plants, having a living cambium 

 ring (68) in such a way that their cambium parts are 

 maintained in intimate contact. Plants that do not have 

 a cambium ring cannot be grafted successfully. If the 

 operation is successful, growth will unite the two parts 

 (69), and plant processes will go on much as if the parts 

 had never been separated. The union usually takes place 

 most rapidly when the cambium cells are in the state of 

 most rapid division, i.e., when growth is most vigorous. 



The more intimate the contact of the cambium in the 

 parts brought together, and the less injury their cells 

 sustain in adjusting them, the more likely are they to 

 unite. 



The plant that it is desired to change by grafting is 

 called the stock, and the part designed to be united to 

 the stock is called the cion (scion), graft or bud. 



Although the tissues of two plants of differing char- 

 acter often unite in grafting, each of the united parts 

 almost always retains its individual character. For ex- 



214 



