Can I plant sweet corn next to bush beans?

Yes. The classic 'three sisters' pairing. WSU Extension confirms the real mechanism: beans climb corn stalks and fix nitrogen the corn uses.

Can I plant sweet corn next to winter squash?

Yes. The third 'three sisters' pairing. WSU Extension confirms squash's broad leaves shade the soil, reducing evaporation and suppressing weeds around corn.

Can I plant sweet corn next to tomato?

Better not to. Both attract the same earworm/fruitworm pest.

Companion Planting: Sweet Corn

Zea mays

Spacing: 1 per square foot. Mature height: 5-8 ft.

Plant these nearby

Bush Beans: The classic 'three sisters' pairing. WSU Extension confirms the real mechanism: beans climb corn stalks and fix nitrogen the corn uses. (source)
Winter Squash: The third 'three sisters' pairing. WSU Extension confirms squash's broad leaves shade the soil, reducing evaporation and suppressing weeds around corn. (source)

Keep these apart

Tomato: Both attract the same earworm/fruitworm pest.

Common pairings, answered directly

Can I plant sweet corn next to bush beans?: Yes. The classic 'three sisters' pairing. WSU Extension confirms the real mechanism: beans climb corn stalks and fix nitrogen the corn uses.
Can I plant sweet corn next to winter squash?: Yes. The third 'three sisters' pairing. WSU Extension confirms squash's broad leaves shade the soil, reducing evaporation and suppressing weeds around corn.
Can I plant sweet corn next to tomato?: Better not to. Both attract the same earworm/fruitworm pest.

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Companion planting for Sweet Corn: which plants to grow next to it, which to keep apart, and the reason behind each pairing.

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