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Companion Plant Checker

Pair 20 common garden vegetables for good or bad companions. Three Sisters callout included.

Updated April 2026

Crop ACrop B

Compatibility

excellent

Basil enhances tomato flavor and repels aphids, whiteflies, and hornworms.

“Three Sisters” callout

The classic Indigenous North American planting: corn + beans + squash. Corn provides a trellis for beans, beans fix nitrogen for all three, and squash leaves shade the soil and deter pests. Plant corn first, add beans 2 weeks later when corn is 6 inches tall, then squash around the perimeter.

Note: Companion planting is a combination of scientific findings (allelopathy, trap crops, nitrogen fixation) and tradition. Results vary by climate, soil, and season — treat these as starting points, not guarantees.

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What it does

Tomato + basil? Excellent. Tomato + corn? Avoid. 20 common crops paired with reasons and alternatives.

Runs entirely in your browser — no upload, no account, no watermark. For more tools in this category see the full tools index.

Embed this tool on your siteShow snippet

Paste this snippet into any page. Loads on-demand (lazy), no tracking scripts, and sized to most dashboards. Replace the height to fit your layout.

<iframe src="https://freetoolarena.com/embed/companion-plant-checker" width="100%" height="720" frameborder="0" loading="lazy" title="Companion Plant Checker" style="border:1px solid #e2e8f0;border-radius:12px;max-width:720px;"></iframe>

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How to use it

Pick two crops.
Read compatibility tier.
Swap if bad.