Companion Planting: What to Grow Together

Some plants help each other grow. Others are chemical enemies. This guide covers the most useful companion plant pairings for your garden.

Companion planting is placing plants together so they benefit each other through pest deterrence, nutrient sharing, or pollinator attraction.

The Three Sisters

Corn provides structure for beans to climb

Beans fix nitrogen from the air into the soil

Squash spreads leaves along the ground, suppressing weeds

Tomatoes + Basil — Basil may repel aphids and whiteflies.

Carrots + Onions — Carrot flies dislike onion smell; onion flies dislike carrot smell.

Roses + Garlic — Garlic deters aphids from roses.

Brassicas + Marigolds — French marigolds deter root-knot nematodes.

Fennel suppresses most vegetables — give it its own bed

Onions + Beans — Onions inhibit bean growth

Potatoes + Tomatoes — Same family, share diseases like blight

Our free Companion Planting Finder instantly shows companions and combinations to avoid.

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