230 GRAFTING 



(1) Different varieties of the same species almost always 

 unite. The Northern Spy apple may be grafted upon the 

 Baldwin apple although the Bartlett pear does not take 

 so well upon the Kieffer pear. In the former case the 

 fruits are of the same species while in the latter they are of 

 different species. 



(2) Plants of different species but of the same genus often 

 unite. Peaches, for example, may be grafted upon plums, 

 or plums upon peaches. Sometimes a graft may be worked 

 one way successfully, but it may fail to unite in the op- 

 posite way. The sweet cherry will grow upon a Mahaleb 

 stock, but the Mahaleb will not grow upon the sweet cherry 

 stock. 



(3) Plants of different genera but of the same family 

 sometimes unite. The pear, for example, unites success- 

 fully upon the thorn, and the oak upon the chestnut; in 

 fact, the pear grafts more successfully on the thorn than 

 upon other pears. Generally, however, plants do not 

 unite as successfully when of different genera as when the 

 botanical relationship is closer. 



Kinds of Grafting. -- The three principal kinds of graft- 

 ing are budding, scion grafting, and inarching or approach 

 grafting. 



Budding. Budding is really the grafting of a small 

 portion of bark containing a living bud. It is used with 

 stock of small diameter and preferably not more than one 

 year old. There is no definite rule, however, as to which 

 plants should be budded in preference to scion grafting. 

 Many plants, as the apple and pear, are propagated both 

 ways, depending much upon local conditions. Budding is 

 the only method extensively used, however, in propagating 

 all stone fruits such as the peaches, plums, and cherries. 



