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Re: Walnut tree
The Black Walnut in particular gives off an oily root substance that is indeed toxic to the root systems of some other plants that it comes into contact with. The last time I checked there would be only a short list of plants resilient to it. I believe most evergreens are unable to survive although the Lilac or Mockorange shrub would not be affected. Unfortunately, I have a neighbour behind me -- yes that's right --with one of the biggest and best and I do believe ----eventually this monster of a tree will take it's toll on my plants that are within it's root range. Pity.