Black walnut trees (Juglans nigra) are notorious for killing other species of trees, shrubs, vegetables and ornamentals planted near them. The trees excrete juglone, a chemical compound that affects plant respiration, from their buds, fruits casings and stems. While black walnut is not the only tree to excrete the substance, it is thought to have the most powerful concentration of the toxin, according to West Virginia University. However, there are plants that can co-exist with the black walnut.
Vegetables, Fruit and Field Crops
Black walnut is particularly deadly to certain vegetables, but others can tolerate being grown near the tree. These include green, lima and snap beans; corn, beets; onions; parsnips; raspberry and black raspberry; cherry; pawpaw; persimmon; clover; red tip grass; orchard grass; Kentucky bluegrass; soybeans and wheat.
Flowering ornamentals that are tolerant of black walnut trees include daylily, iris, phlox, Shasta daisy, Virginia creeper, bluebells, daffodil, ferns, fescue, Jack-in-the-pulpit, liriope, narcissus and trillium.
Shrubs and Trees
A wide range of shrubs and trees have an immunity or low sensitivity to juglone and can be planted within or near the drip line of the tree or where a tree once stood. Options include red cedar, elm, winged euonymus, forsythia, hawthorn, hemlock, hickory, black locust, most maples, most oaks, autumn olive, pachysandra, wild rose, sycamore and a majority of viburnum species.