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Companion Planting Checker
Select any plant to see its best companions and worst neighbors — plus why each relationship helps or hurts.
| Relationship | Plants | Why It Works / Doesn't |
|---|
Select any plant to see its best companions and worst neighbors — plus why each relationship helps or hurts.
| Relationship | Plants | Why It Works / Doesn't |
|---|
Companion planting is the practice of growing different plants near each other for mutual benefit. Benefits include pest control, improved pollination, better use of space, and in some cases improved flavor. The classic example is the Three Sisters — corn, beans, and squash grown together.
The evidence is mixed but real for several well-studied pairings. Marigolds genuinely deter root-knot nematodes — this is well-documented. Basil near tomatoes does appear to repel aphids and whitefly. Some companion planting is folklore, but the best-known pairings have real scientific backing.
Keep tomatoes away from fennel (allelopathic), brassicas (compete for nutrients), and corn (both attract Helicoverpa caterpillars). Never rotate tomatoes into a bed that previously grew potatoes, eggplant, or peppers — they share diseases.