planting around a black walnut tree - Knowledgebase Question

Milwaukee, Wi
Question by stellaz2769
August 11, 2008
I have a large black walnut tree. Around the tree, what can I plant that the tree won't kill. I did transplant some day lillies and they made it. What else, with colors. The day lillies bloom early and then no color.

Answer from NGA
August 11, 2008


Black walnut (Juglans nigra) has a reputation for being allelopathic--that is, for inhibiting the growth of other plants. Small amounts of a substance called juglone are released by the tree roots, but a far greater amount of this growth-inhibiting chemical is found under the canopy of the tree. Some plants that are tolerant to juglone include: arborvitae, cedar, catalpa, clematis, daphne, elm, euonymous, forsythia, hawthorn, hemlock, sycamore, astilbe, begonia, bellflower, orange hawkweed, hosta, pansy, phlox, marigold, primrose, snowdrop, sweet woodruff, trillium and zinnia.

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