I read that Eastern Black Walnut trees produce much more Juglone than Western ones. The eastern variety is a problem for many gardeners in this area, especially when combined with slow draining clay soil. I even did a little experiment. Reading that tomatoes are especially juglone sensitive, last year I planted some extra tomato seeds in pots. I planted 3 in pots of soil from my front garden, three with soil from the back garden. The pots were placed together and watered at the same time. The front pots all germinated, none of the back ones did.
I am beginning to love hostas. They do so well with so little bother, allowing me time for the roses. Some lilies tolerate shade. I have both native orange day lilies (ok, not technically a lilly) and tiger lilies (not daylilies, spotted orange lilies) in my shady flower bed.
