eastern black walnut

T

tomato

Solanum lycopersicum

Juglans nigra exudes juglone (5-hydroxy-1,4-naphthoquinone), an allelopathic compound that causes wilt and death in solanaceous plants including tomato within a 50-80 ft radius.

C

chili pepper

Capsicum annuum

Juglone from black walnut roots and fallen foliage inhibits the growth of peppers and other sensitive solanaceae family members.

C

cabbage, broccoli, and allies

Brassica oleracea

Juglone produced by walnut trees suppresses growth and productivity in brassicas and other susceptible plants within its root zone and drip line.