BURBANK'S WAY WITH TREES 



importance in recent years. As to the actual num- 

 ber of nut-bearing trees under cultivation, the 

 almond heads the list, the trees in bearing in 1910 

 numbering 1,187,962, in addition to which there 

 were almost 400,000 young trees not yet in bear- 

 ing. The total marketable production of almonds 

 in 1909 had a value of more than $700,000. 



OTHEE HYBKIDIZING POSSIBILITIES 



When the economic value of nuts is under con- 

 sideration, however, the palm must be yielded to 

 the Persian walnut, which produced in 1909 a crop 

 valued at $2,297,000. The number of walnut trees 

 in bearing was less than the number of almond 

 trees, but the value of the crop borne on an indi- 

 vidual tree is much larger. 



It should be noted that all but about sixty thou- 

 sand of the Persian walnut trees in bearing in 

 1910 in the United States were in California. But 

 the value of walnuts as a market crop has re- 

 cently come to be appreciated elsewhere, and 

 orchards of young trees are rapidly being intro- 

 duced in other states, including, notably, Oregon 

 and Mississippi. 



Unfortunately, the Persian walnut is not a 

 hardy tree. Yet it might be cultivated in many 

 regions where it has hitherto been altogether neg- 

 lected ; and the results obtained in California sug- 

 gest that it is well worth the attention of horti- 

 culturists throughout the southern and central 

 regions of the United States. Moreover, there is 



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