The leaves are about 1 foot long, with 13 to 21 leaflets with dentate (coarsely toothed) margins. 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. Toxic Juglone . Crushed leaves have a strong smell. 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. 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. 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. Avoid exposed sites or frost pockets where strong winds and late frosts may damage flowers. Walnut trees grow throughout Britain and are happiest in free-draining, fertile and moisture-retentive soil in the sunniest position possible. Twigs are stout, green and curving. 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. Walnut is a deciduous broadleaf tree which can grow to 35m. Growing black walnut trees for wood and profit in America. In fact, they can be toxic to nearby plants. Black walnuts contain a chemical called juglone which can be allelopathic to other plants. 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. Heavy clay or sandy soils are not ideal. 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