It usually takes 7-8 years to produce results.

Walnut tree, adult tree trunks on different varieties, its height is generally in the 2 ~ 10 meters, high or more than a dozen meters; broad crown; bark gray-green when young, old gray-white and longitudinally fissured; branchlets glabrous, glossy, peltate bearing glands, gray-green, later brownish.

Expanded Information:

Walnut, also known as pecan, qiangmao, is a member of the pecan family. With walnuts, cashews, hazelnuts and known as the world famous "four big dry fruit". Walnut kernel is rich in nutrients, per 100 grams of protein 15-20 grams, more fat, carbohydrates 10 grams; and contains essential calcium, phosphorus, iron and other trace elements and minerals, as well as carotene, riboflavin and other vitamins. Beneficial to the human body. It is one of the nut foods loved by the people.

Reference Links: Baidu Encyclopedia - Walnuts