Walnut trees especially black walnuts produce a natural chemical called juglone, which is released from their roots, leaves, and husks into the surrounding soil. This compound can inhibit the growth of certain Flowers Need Time To Bloom So Do You T shirt Gardening Plant Mama Gift Positivity Top Garden Flower Tee Wildflowers Tshirt White sage Waterwise Garden Planner Spotlight on Weeds: Broadleaf plantain (Plantago major)