All of mine are next to one. Only reason I wouldn't recommend growing near it are the squirrels and roots. Every morning and sometimes later in the early summer I have to throw them out my garden. If I don't the squirrels will enter. I think they mistake the rhizomes for nuts and that's my only issue. There is black walnut saw dust everywhere from squireels nibbling through the nuts from above. Rhizomes are fine and increasing and so far zero toxic issues. The tree is tall, but I think fairly young still.
