Can I plant pumpkin next to sweet corn?

Yes. The same 'three sisters' mechanism as winter squash: WSU Extension confirms pumpkin's broad leaves shade the soil, suppressing weeds and reducing evaporation around corn.

Can I plant pumpkin next to winter squash?

Better not to. Cross-pollinates and competes heavily for space and nutrients.

Companion Planting: Pumpkin

Cucurbita pepo

Spacing: needs about 10 square feet per plant. Mature height: 1-1.5 ft.

Plant these nearby

Sweet Corn: The same 'three sisters' mechanism as winter squash: WSU Extension confirms pumpkin's broad leaves shade the soil, suppressing weeds and reducing evaporation around corn. (source)

Keep these apart

Winter Squash: Cross-pollinates and competes heavily for space and nutrients.

Common pairings, answered directly

Can I plant pumpkin next to sweet corn?: Yes. The same 'three sisters' mechanism as winter squash: WSU Extension confirms pumpkin's broad leaves shade the soil, suppressing weeds and reducing evaporation around corn.
Can I plant pumpkin next to winter squash?: Better not to. Cross-pollinates and competes heavily for space and nutrients.

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

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