Companion plants for summer squash

In a Three Sisters planting, squash covers the ground around corn.

Large squash leaves shade the soil, which is described as helping hold moisture and limit weeds. Traditional systems often used vining winter squash; bush zucchini behaves differently.

Spacing: Allow full mature squash spread; crowding reduces corn and squash growth.

Pests: No pest-control benefit is claimed for this pairing.

Beans and squash are the companion pair in the Three Sisters system.

Both are grown around corn in the traditional system. Outside that layout, there is no sourced benefit specific to these two crops.

Spacing: Preserve each crop's mature spacing.

Pests: No pest-control benefit is claimed for this pairing.

Cucumbers and squash share cucumber beetles.

Striped and spotted cucumber beetles feed on cucumber-family crops and can spread bacterial wilt, especially in cucumbers. Planting them together concentrates a shared pest, not a chemical incompatibility.

Spacing: No safe separation distance is established; monitor both crops.

Pests: Scout seedlings early; row covers until flowering are a common tool.