NUT TREES FOR ROADSIDE PLANTING 
103 
to age. At the age of 51 years, it had a breast-high 
circumference of 10 feet 11 inches. As showing the 
utility value of the species, it may be mentioned that this 
tree not infrequently produces several bushels of nuts in 
one season. 
The length of time required to bring a Black Walnut 
into production is variable. In a Pennsylvania nursery a 
tree has been photographed 
which was grafted when 
three years of age and which, 
in its fourth year, produced 
7 nuts. This early fruitful¬ 
ness is not wholly desirable, 
as it is better for a tree to 
grow for 6 or 7 years before 
it is allowed to bear. Never¬ 
theless, this instance is im¬ 
portant in showing that the 
time of production is largely in the hands of the grower. 
Some specimens run for 15 or 20 years before producing, but 
this time may be reduced by grafting. Different varieties 
may vary also in the matter of leafing-out in the spring and 
shedding leaves in the autumn, and in resistance or suscep¬ 
tibility to the attacks of insect pests and fungus diseases. To 
realize best results, these differences must be taken into 
consideration when seed or young trees are being se¬ 
lected for planting. A good rule to follow is to be sure 
that the seed came from a tree which had as nearly as 
possible the qualities wanted, and latitude and soil condi¬ 
tions as nearly similar as possible to those of the new 
planting. 
In California, the highway authorities are planting 
many miles of roadway with Black Walnut trees. Stretches 
of roads lined with magnificent trees of this species may 
