Common walnut (Juglans regia) is a large, long-living deciduous tree. As a result of many years of cultivation, its native range is difficult to determine, but the tree is believed to have its origin in the Mediterranean region and central Asia. Today, the common walnut is cultivated in temperate climates around the whole world and is sometimes found hybridized with the black walnut (Juglans nigra).
Common walnut is highly valued for its nutritional seeds, i.e. walnuts. The tree’s valuable and high-quality timber is also important economically, used for making furniture and veneer. Its bark, and leaves, as well as the husks of the seeds, are used in different medicines and dyes. Additionally, tannins are extracted from the tree.
Common walnut needs fairly specific conditions to thrive: it requires warmth, shelter and abundant light and prefers deep and rich soils with pH values between 6 and 7.5. The tree grows in pure stands or as individual trees, sensitive to competition from other plants.
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