CULTURAL METHODS, PurM\<; FOK PLUMS AND PRUNES 1175 



rows forty or fifty feet apart and grow some other crop between. 

 This custom, however, has never found widespread favor. Mixed 

 planting for cross-pollination has demanded but little attention 

 in this state. Most commercial orchards consist of Domesticas, 

 ami this species under ordinary orchard conditions seem to be 

 self-fertile. 



Fie. 385. BURBANK PRUNED, WITH THE EXCESS GROWTH REMOVED BY 



HEADING-IN 



The relative advantages of fall and spring planting are often 

 discussed. Very much depends on the locality, season, condi- 

 tion of the trees, and the soil. Trees whose wood is thoroughly 

 hardened and ripened might be set in the fall in soil which is 

 well prepared, but the practice cannot be recommended. As a 

 rule, it would be much better to store the trees in a suitable cellar 

 through the winter and plant in the spring. Of course, fall 

 planting sometimes has the advantage of enabling the grower to 



