TomatoSolanum lycopersicuminhibits growth
Black walnut juglone inhibits nightshades.
What to plant with English walnut
Juglans regia
English walnut grows best when paired with plants that complement its needs. and 4 antagonists to avoid. Every pairing below cites its mechanism — pest deterrence, nitrogen fixing, allelopathy, or shared disease.
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Keep away from these they fight
4 plantsTomatoSolanum lycopersicuminhibits growth
Juglone toxic to many garden crops.
PotatoSolanum tuberosuminhibits growth
Roots or leaves release chemicals that suppress neighbouring plants. Often a one-way problem (walnut → most vegetables).
BilberryVaccinium myrtillusinhibits growth
Roots or leaves release chemicals that suppress neighbouring plants. Often a one-way problem (walnut → most vegetables).
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Frequently asked
What should I NOT plant near English walnut?
Avoid Tomato, Tomato, Potato, and 1 other antagonists. Reasons vary — allelopathy, shared pests, or resource competition. See the section above for each plant's specific issue.
Is companion planting scientifically proven?
Some mechanisms are well-documented (legume nitrogen fixation, allelopathy in walnut and fennel, nematode suppression by marigolds). Others are traditional pairings with anecdotal support. We cite both, but mark mechanism strength where available.
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