Corn Companion Plants
Vegetable85 days to maturity
Corn is a tall, wind-pollinated grass that is also one of the garden's hungriest nitrogen feeders. Because pollen must drift from the tassels to the silks of nearby plants, it must be grown in blocks rather than single long rows for ears to fill out fully. Its main headaches are corn earworm in the ear tips, raccoons and birds raiding ripe ears, and patchy pollination that leaves gaps of missing kernels.
Companion Checker: what grows well with Corn?
Tap any plant to see whether it pairs well with Corn and why. Green means a beneficial companion, red means keep them apart.
Want to lay out a whole bed? Open the full drag-and-drop companion planting tool →
Companion Planting Strategy for Corn
Corn anchors the Three Sisters: its sturdy stalks become a living trellis for climbing beans, which in turn fix nitrogen to feed the corn. The companion strategy is to pair corn with plants that either supply nutrients, shade and protect its shallow roots, or use its vertical structure, while avoiding crops that share its pests.
Best Companion Plants for Corn
These plants grow well alongside Corn — providing pest control, attracting pollinators, or making better use of your garden space.
Pole beans climb the corn stalks for free support while their roots fix nitrogen that the nutrient-hungry corn needs to thrive.
Squash's broad, sprawling leaves shade the soil to suppress weeds and hold moisture, and its prickly vines help deter raccoons from raiding the corn.
Cucumbers enjoy the light shade and wind protection of tall corn and can scramble up the stalks, while their shallow roots stay out of the corn's way.
What Not to Plant With Corn
Keep these away from Corn. They compete for resources, attract shared pests, or inhibit each other's growth.
Corn and tomatoes are both attacked by the same caterpillar, Helicoverpa zea, known as corn earworm and tomato fruitworm, and both are heavy feeders that compete for nutrients.
How to Grow Corn
- Botanical name
- Zea mays
- Family
- Grass (Poaceae)
- Sun
- Full sun, 6-8+ hours daily
- Water
- 1-1.5 inches per week, especially critical during tasseling and silking
- Soil
- Rich, well-draining soil high in nitrogen and organic matter, pH 6.0-6.8
- Spacing
- 8-12 inches apart in rows 30-36 inches; plant in blocks of at least 4 rows for pollination
- Planting depth
- 1-2 inches deep
- Germination
- 7-10 days at 60-85F
- Days to maturity
- 60-100 days depending on variety
- When to plant
- Direct sow 1-2 weeks after the last spring frost once soil reaches 60F
- Harvest
- Pick when silks turn brown and dry and kernels release a milky juice when punctured, usually about 3 weeks after silking
Common Corn Problems
Corn earworm (caterpillars feeding inside the ear tips)
Apply a few drops of mineral oil to the silks after they wilt, plant tight-husked varieties, and spray Bt on the silks; clip damaged tips off at harvest.
Poor pollination (ears with missing or scattered kernels)
Plant in compact blocks of at least 4 rows rather than single rows, and hand-pollinate by shaking tassels over the silks to ensure every kernel is fertilized.
Raccoons and birds raiding ripe ears
Use electric or mesh fencing, slip paper bags or footless stockings over ears as they ripen, and harvest promptly once ears are ready.
Corn smut (swollen gray-white galls on ears, stalks, or tassels)
Caused by the fungus Ustilago maydis; remove and destroy galls before they rupture and release spores, rotate crops, and clean up debris in fall.
Corn Companion Planting FAQ
What are the best companion plants for corn?
Beans, squash, and cucumbers are the top companions for corn. Beans climb the stalks and fix nitrogen, squash shades the soil and deters raccoons, and cucumbers use the shade and vertical support in the classic Three Sisters arrangement. Herbs and flowers nearby also help by attracting beneficial insects.
What should you not plant with corn?
Avoid planting corn near tomatoes because they share the same damaging caterpillar, known as corn earworm on corn and tomato fruitworm on tomatoes, which lets pest populations build up. Both crops are also heavy feeders that compete for soil nitrogen, so keep them in separate beds.
How do you plant corn so the ears fill out?
Plant corn in blocks of at least four short rows rather than one or two long rows, since wind must carry pollen from the tassels to the silks of neighboring plants. Tight block planting dramatically improves pollination and prevents ears with gaps of missing kernels.
When should you plant corn?
Direct sow corn outdoors 1-2 weeks after your last spring frost, once soil temperatures reach at least 60F, since cold soil causes poor germination. For a longer harvest, plant successive blocks every two weeks or choose varieties with staggered maturity dates.
More vegetable companions
Plan Your Corn Garden
Use our interactive tools to design the perfect garden with Corn and its companions.