Black Walnuts produce a substance in their roots called juglone, which creates a toxic zone in the soil around the tree for about a 50 foot radius. This is why so many plants will not grow under this species including Asparagus, Azaleas, Chrysanthemums, Hydrangeas, Lilacs, Lilies, Peppers, White Pines, Tomatoes, and Yews.
Here are a few plants that can survive in the root zone of walnut.
- Perennials: Ajuga, Cranesbill, Coral Bells, Crocus, Hollyhock, Hosta, Lamb’s Ear, Sensitive Fern
- Annuals: Fibrous Begonia, Pansy, Zinnia
- Vegetables: Beans, Carrots, Corn, Melons, Squash
- Fruit: Cherry, Peach, Plum, Nectarines
- Shrubs: Arborvitaes, Euonymus, Honeysuckle, Korean spice Viburnum, Rose of Sharon
- Trees: Canadian Hemlock, Eastern Redbud, Japanese Maple
You can find a complete list at Longfellow’s. Check with our Certified Nurserymen for more information.