How to take care of black walnut trees?
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Here you go!
https://www.walnutcouncil.org/resources/growing-hardwoods/managing-your-trees.html
https://www.doityourself.com/stry/6-walnut-tree-care-tips
https://www.almanac.com/content/black-walnut-trees-roots-evil
http://www.extension.umn.edu/garden/yard-garden/trees-shrubs/growing-black-walnut/
We don’t actually do anything for our black walnut besides dead branch removal and a bit of thinning. It puts out its own natural toxin so many plants will die if planted near them. We get a kagillion seedlings every year and if we ignored them would have a black walnut forest. They will even sprout and grow in the shade.