My yard is very shady. Last year we lost a huge black walnut tree in a storm-the tree has been removed and the stump has been chipped out (there are no other black walnut trees). That site is now the sunniest spot in my yard and I would like to put some raised beds in to grow vegetables-especially tomatoes. I know black walnuts and tomatoes don't mix, but I'm wondering how long the soil will stay toxic and if I fill my raised beds with fresh soil, will I be safe to grow tomatoes? Any suggestions are very much appreciated :)

Deb