Walnut trees release juglone--a chemical that discourages competition by damaging nearby plants--into the soil. Many flowers, however, tolerate juglone. They include irises, hollyhocks, asters, phlox, chrysanthemums, tulips and sunflowers. Gardeners with walnut trees can create widely varied landscapes using these and other popular, juglone-tolerant flowers.
About this Author
A freelance writer, Judy Wolfe has owned Prose for the Pros, a freelance writing business, since 2006. She's been an inveterate traveler since 1961 and draws on her travel experiences to provide articles for such websites as Chincoteague Island Vacations and Berlin Dude. Wolfe holds a Bachelor of Arts in literature from California State University at Pomona.