In one place in the yard, there is a carpet of ivy under a black walnut. Would it harm the tree in any way to let the ivy up to the base of the branches? I would like to do this so that the whole scene is green.
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No, as long as it doesn't compete for light, the tree is healthy, and the soil situation is normal, ivy is fine on tree trunks. Ivy is not a parasite. Here's a good article.
The Alien Plant Working Group of the Plant Conservation Alliance lists English Ivy as invasive in many states, including PA.
Ed Staub
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Walnut and butternut trees try to ensure that there are no competitors for light and water by excreting a substance called juglone. It inhibits the growth of some plants. I cannot find ivy listed as being tolerant which would indicate that it's growth would be stunted.
You could try Virginia Creeper which is tolerant however a well established plant could compete with the walnut tree and inhibit it's growth.
With the price of black walnut wood you could be better off pruning it so it has a good form and then selling it when you want to retire.
kevinskio
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