Many plants will not grow well within 50 feet of the drip line of a walnut tree. Tomatoes for one. Can not remember the others.
Corn, beans, and melons are tolerant of walnut toxicity. Can’t remember the rest.
We grew our tomatoes last year in two “topsy turvey” planters. Surprising, it worked pretty well and didn’t take up any garden space. My wife planted tomatoes this year in the raised garden and they are doing fine.