The north California walnut, also called Hind's black walnut, is a medium-sized tree with a short, bulky look, since the crown is often wider than the height of the tree. The highest concentration of juglone will be within the dripline, but the tree’s roots (and the juglone’s effects) can stretch to a distance that equals the tree’s height. Look out for: the leaflets which have toothed edges. The trees get about 80 feet tall, but they’ve been known to reach as high as 150 feet. Twigs are stout, green and curving. The trunk on mature trees can be 5 to 6 feet in diameter at the base. Walnut is a deciduous broadleaf tree which can grow to 35m. Black walnut trees are prized for their dark colored heartwood. Look out for: crushed leaves that smell like polish. Black Walnuts (Juglans nigra) I have a lot of black walnuts that grow wild on my farm, but if you aren’t so lucky, you can purchase young trees to plant. Toxic Juglone . In fact, they can be toxic to nearby plants. The tree gets its name from its dark, heavily ridged bark which occurs even when it is still young. Very often, when sensitive plants are grown near the roots of black walnut trees, the plants die. Crushed leaves have a strong smell. With plants that are sensitive to the juglone black walnut trees produce, experts recommend they be placed outside of the tree’s dripline, or at minimum, at a distance of 50 feet from the black walnut tree. Avoid exposed sites or frost pockets where strong winds and late frosts may damage flowers. The bark is smooth and olive-brown when young, developing fissures and fading to silver-grey with age. But black walnut trees are not always good companions in the garden and yard. Black walnut is a large, broadleaf tree which can reach 30–40m high. Identified in winter by: the segmented pith, or spongy tissue, inside the twig. The leaves are about 1 foot long, with 13 to 21 leaflets with dentate (coarsely toothed) margins. Black walnut are so valuable in fact forestry officials are often called on to track down black walnut poachers; in 2004, DNA testing was used to solve one such poaching case, involving a 95-foot black walnut tree worth US $28,500. Growing black walnut trees for wood and profit in America. They typically have a short trunk and broad crown, though can be narrower if grown in a woodland situation. Heavy clay or sandy soils are not ideal. They are native to the Eastern U.S. and grow as far north as Maine in USDA Zones 4-9. Black walnuts contain a chemical called juglone which can be allelopathic to other plants. Walnut trees grow throughout Britain and are happiest in free-draining, fertile and moisture-retentive soil in the sunniest position possible.

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