forestryworks
Addicted to ArboristSite
Ever see a walnut tree with poison ivy on or near it?
Sure have. After all, Poison Ivy thrives in light to moderate shade.
However, Black Walnut (Juglans nigra) contains an alleopathic chemical called juglone, which inhibits respiration of sensitive plants, but Poison Ivy is not on the list of sensitive plants. Not arguing with you, just throwing it out there.
Can't beat using Glyphosate, repeated mowing, thinning, grazing (increased sunlight tends to decrease poison ivy), and when safe to do so (and you have the required training, certification, insurance as required by your local, regional, and state laws), prescribed burning for controlling P. Ivy. Using a combination of the aforementioned management techniques will work the best.
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