Black walnuts produce the chemical juglone. Juglone has walnut-protecting fungicidal and insecticidal properties. It also prevents many competing plants, including apple and sweet cherry trees, from thriving nearby. Juglone-tolerant peach, plum cherry, quince and nectarine trees, however, grow well next to black walnuts.
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.