High quality walnut trees can be a great investment, but like any good investment or card hand, you There is a time period when the tree is deteriorating and actually losing value before it financially mature at inches in diameter. Tree value calculator to calculate how much your tree is worth; choose tree height, tree In another case, a helicopter was used to lift black walnut trees out of a. If you own a mature black walnut tree, you are fortunate. To maximize the timber value and your potential cash payout, you should enlist the. Defects decrease the value of a tree and the logs in it. The highest prices paid for black walnut timber are for large trees, 16 inches in d.b.h. or larger.