LUTHER BURBANK 
I speak thus in detail of this variety of the 
Japanese walnut, because its qualities are such as 
to merit fuller recognition than it has hitherto re- 
ceived. The tree is perhaps as hardy as the Amer- 
ican black walnut; it is as easily grown, and per- 
haps even less particular as to soil and climate. 
The trees are very productive, especially as they 
grow older. The branches droop under the weight 
of the nuts. Where other walnut trees bear nuts 
singly or in clusters of twos or threes, the Japanese 
walnut tree bears long strings of nuts, sometimes 
thirty or more in a single cluster. The nuts are 
thickly set about the axils, the cluster being from 
six to twelve inches in length. 
HYBRIDIZING NATIVE WALNUTS 
The cross between the Persian and Japanese 
walnuts, like that between the Persian and the Cal- 
ifornia black walnut, did not result in producing 
a tree that had exceptional value as a nut pro- 
ducer. This cross, like the other, seemingly brings 
together strains that are too widely separated; and 
while there is a great accentuation of the tendency 
to growth, so that trees of tremendous size are 
produced, there is relative sterility, so that a tree 
sometimes bears only a few individual nuts in a 
season. 
But the results were very strikingly different 
as regards the matter of bearing when the Cali- 
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