Upon moving into my new house a year ago, I rejoiced when I discovered that several black walnut trees grow in my backyard. However, once I started doing some horticultural planning, I began to worry that the alleopathic effect of the juglone that black walnuts secrete from their roots would limit my chances for planting around those trees.
A quick Google search, however, turned up a paper entitled “A review of suitable companion crops for black walnut” which lists various companions that seem to tolerate juglone. The possibilities include currants, elderberries, black raspberries, pawpaws, persimmons, autumn olives, onions, and Jerusalem artichokes.
The moral of the story? Just because you secrete juglone, doesn’t mean you have to live alone.