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keep the soil moist. Keep mulch away from the trunk to reduce rodent damage. Water the tree once a week during dry spells until it is established.
The black walnut is monoecious, having both male and female blossoms on the same tree, but it may not be self-pollinating when both blossoms do not open at the same time. Cross pollination may be necessary by planting more than one tree.
Interaction With
Other Plants
This tree is an interesting subject of alleopathy that describes the interaction of plants to each other. If excretes a chemical into the soil called juglone which harms other plants and cuts competition for growing space. It is specially harmful to tomatoes, rhododendrons, azaleas, and many other acid-loving plants.
Pruning
Pruning may be necessary when trees are young to check excess side branches. Later pruning would be like any shade trees - cutting out dead wood, crossing branches, and slender-angle branches that could split. If a tree with grafted rootstock was planted, remove suckers from the base. As the walnut bleeds pro
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