⚠️ Almost everything
Fennel releases allelopathic chemicals from roots and leaves that inhibit seed germination and growth of beans, tomatoes, peppers, kohlrabi, caraway, coriander, and virtually all garden vegetables.
⚠️ Coriander/Cilantro
Fennel severely inhibits cilantro growth; also cross-pollinates, ruining both seed crops.
Cross-pollination risk; fennel suppresses dill growth.
⚠️ Beans
Strong growth inhibition; beans are particularly sensitive to fennel's allelopathy.
⚠️ Tomatoes
Stunted growth and poor fruit set reported.
Mutual antagonism; both herbs suffer.
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of artichoke. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of arugula. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of ashwagandha. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of asparagus. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of beet. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of bell pepper. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of bok choy. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of borage. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of brussels sprouts. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of bush bean. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of carrot. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of celery. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of cilantro. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of collard greens. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of cucumber. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of edamame. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of eggplant. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of endive. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of fava bean. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of jalapeño pepper. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of kohlrabi. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of leek. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of lettuce. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of melon. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of mustard greens. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of nasturtium. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of okra. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of parsnip. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of pole bean. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of pumpkin. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of radish. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of runner bean. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of rutabaga. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of spinach. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of strawberry. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of summer squash. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of sweet corn. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of sweet potato. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of swiss chard. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of tomato. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of turnip. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of watermelon. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of winged beans. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of winter squash. Keep well separated (30+ ft).
Fennel is strongly allelopathic — its root exudates inhibit germination and growth of zucchini. Keep well separated (30+ ft).