My grass is very sparse at best under my Black Walnut tree. I wonder is the juglone responsible for that?
What Grass Grows Well Near Black Walnut Trees?
Certified GKH Gardening Expert
You are correct in that there the Juglone will inhibit grass growth under and around the Black Walnut Tree.
There are many plants and ground covers that will do well.
Here is a few links with more information.