70 HORTICULTURE FOR SCHOOLS 



of the Beech family. Members of different genera of the 

 same family may or may not unite. For example, in the 

 Rose family it is possible to graft some kinds of pears (genus 

 Pyrus) upon the quince (genus Cydonia), but it is not pos- 

 sible to grow the apple (genus Pyrus) upon the peach (genus 

 Prunus). It may be said at this point that stone-fruits will 

 not grow on pome-fruits and vice versa. Different species 

 of the same genus commonly, though not always, unite suc- 

 cessfully; for example, in the genus Prunus, the peach 

 (species name Persica) can be united with the common 

 plum (species name domestica). Varieties within a species 

 commonly unite when budded or grafted; thus, any two 

 varieties of peaches will unite, or any two varieties of apples. 

 While botanical relationship may indicate the probabilities 

 as to the ability of any two plants of different kinds to 

 unite, experimentation is the only means of ascertaining the 

 facts with finality. 



104. Essential points in grafting or budding. Success in 

 grafting or budding depends on the observance of the follow- 

 ing rules: 



1. The stock must be suitable to the cion. 



2. The operation must be done at the right -time of year 

 and under proper conditions. 



3. The cambium tissue of the cion must be in contact 

 with the cambium of the stock. 



4. The wounds must be prevented from drying out. 



5. Proper attention must be given the tree after graft- 

 ing or budding. 



105. Budding. Though a few kinds of trees are better 

 adapted to one process than to the other, in general, as far 

 as propagation itself is concerned, it makes very little differ- 

 ence whether budding or grafting is employed. The choice 

 of method will depend on considerations of convenience. 

 Budding is performed during the growing season. Budding 

 can be done faster than 1 grafting, and more trees can be 



