On some pasts questions on this site, I discovered that walnuts release Juglone, which is nasty for the growth of many plants.
I had/have a part of the vegetable garden partly under a Juglans regia, for more shadow tolerant vegetables. Note: still few meters away of trunk, and sun reach for good part of the day the vegetable garden. So I wondering if I can still plants some vegetables, and which one. On past, I had usually peas/green beans, potatoes and celery/parsley under the plant.