Companion Plants for Sweet Corn

Traditional companions for sweet corn include pole beans, winter squash, pumpkins, bush beans, cucumbers, head lettuce and 8 more in the table below.

Keep cherry tomatoes and tomatoes away from it.

These are garden traditions, collected from 12 US extension guides. Few have been tested in trials, so treat them as a starting point: spacing, sun and rotation matter more.

Good companions for sweet corn

Spacing is per square foot, for a raised bed planted square by square. Cool-season companions can share the bed before or after a warm-season crop, or grow in its shade.

Traditional companions for sweet corn
Plant	Kind	Spacing	Season
Bush Beans	Vegetable	9 per sq ft	Warm season
Cucumbers	Vegetable	2 per sq ft	Warm season
Head Lettuce	Vegetable	1 per sq ft	Cool season
Leaf Lettuce	Vegetable	4 per sq ft	Cool season
Peas	Vegetable	8 per sq ft	Cool season
Pole Beans	Vegetable	8 per sq ft	Warm season
Potatoes	Vegetable	1 per sq ft	Cool season
Pumpkins	Vegetable	1 per 9 sq ft	Warm season
Romaine Lettuce	Vegetable	1 per sq ft	Cool season
Zucchini and Summer Squash	Vegetable	1 per 4 sq ft	Warm season
Winter Squash	Vegetable	1 per 2 sq ft	Warm season
Parsley	Herb	1 per sq ft	Cool season
Sage	Herb	1 per 2 sq ft	Warm season
Sunflowers	Flower	1 per 2 sq ft	Warm season

What not to plant with sweet corn

Cherry Tomatoes: usually planted in a different bed.
Tomatoes: usually planted in a different bed.

What the evidence says

Companion planting charts come from long garden experience, and most pairs have never been tried in a replicated trial. Several extension services say so directly; one review gives traditional charts more entertainment than scientific value.

What reliably helps sweet corn: the right planting dates, enough space, and moving crops to a new bed each year (crop rotation).

Plant them side by side

Draw your beds, tap squares to plant sweet corn next to their companions, and get every crop's planting dates for your ZIP code. Free, in your browser.

Open the garden planner When to plant sweet corn

Questions

What can I plant with sweet corn?

The traditional companions are pole beans, winter squash, pumpkins, bush beans, cucumbers, head lettuce, leaf lettuce, parsley and 6 more listed above. Plant companions in neighbouring rows or squares rather than in the same hole.

What should not be planted with sweet corn?

The guides keep cherry tomatoes and tomatoes apart from sweet corn. Give them a different bed.

Does companion planting with sweet corn work?

Most pairings are tradition rather than tested results: extension services call companion planting promising but largely unproven. None of the pairs for this crop has been tested in a trial we could find. Good spacing, sun, water and rotation do more for a harvest than any single pairing.

How close can parsley grow to sweet corn?

In a raised bed planted by the square foot, give sweet corn 1 per sq ft and parsley 1 per sq ft, in neighbouring squares. In rows, sweet corn needs 10 in between plants.