The walnut is an edible seed of any tree of the genus Juglans, best known of which is the Persian walnut - Juglans regia, although in North America you could argue that it is in fact the native Black Walnut.
All types of walnuts are quite hardy, and actually require a cold winter period in order to thrive. So anyone living in warmer climates won't have much success with their own walnut trees.
Walnuts will start to produce nuts at around 10 years of age, give full production at 30 years and keep on producing for more than 50 years. Depending on the specific variety of the walnut tree, they can grow up to 100 feet in height.
Caring for walnut trees
Webworms or tent caterpillars can be a problem if there are too many of them on your trees. They build large tents of webbing, that can house hundreds of hungry caterpillars. Cut any branches off with tents and dispose of them carefully.
Full size trees have very long and deep root systems, which usually can protect them from moisture problems on the surface. But after very prolonged periods of drought, your trees might need some watering. You can end up with 'burned' walnuts come harvest time if you let your trees get too dry for too long. Walnut trees should be left to grow naturally without pruning.
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