The bearing size of a Ukrainian Walnut Tree is about four years old in age. The Ukrainian Walnut trees are extremely cold hardy and grow vigorously in zones 4 to 9. At harvest time the shuck that covers the Ukrainian Walnut falls freely from the inner nutshell, making it much easier to shell. The shells of the Ukrainian Walnuts are relatively thin, and the nuts are delicious with a distinctive flavor full of oily crunchy flavorful kernels. The developing nuts of the Ukrainian Walnut Tree are formed from tiny, insignificant looking green flowers, male and female, that are wind self-pollinated. The Ukrainian Walnut Trees prefer a soil pH that is less acid than most other nut trees that thrive in a pH of 6 to 8. The Ukraine countryside is the home to a very cold hardy walnut tree that was found growing in the Carpathian Mountains where the walnuts were collected.