What to Plant With Pumpkins: Pumpkin Companion Plants (and What to Avoid)

Pumpkins are a warm-season vine crop in the cucurbit family, along with squash, zucchini, melons and cucumbers. They need warm soil, a long season and a lot of room, and they sprawl over anything planted too close. That makes companion planting for pumpkins less about mixing many crops into one bed and more about choosing a few neighbors that can share space with a running vine. Here is what extension sources list, what to keep away, and how to plant and harvest pumpkins that store well.

Good companion plants for pumpkins

Corn

Corn and pumpkins are listed as companions in both directions of Virginia Extension's table, and the publication describes the pairing directly: when corn is planted with squash or pumpkins, the mixed canopy is believed to disorient the adult squash vine borer, and the prickly vines tend to discourage raccoons from raiding the sweet corn. It is the same idea as the Three Sisters planting of corn, beans and squash. Plant the corn first in a block, then let pumpkin vines run between or around the rows once the corn is established. See what to plant with corn.

Marigolds

Virginia Extension lists marigolds as a pumpkin companion. Put them where the vines will not bury them, such as the edge of the patch or between hills early in the season. Their best-documented benefit is against root-knot nematodes when grown as a dense cover crop ahead of the vegetables, not a few tucked among them; our marigold guide explains how that works.

Beans and nasturtiums

These are not on the pumpkin row in our sources, but they are close relatives of pairings that are. Beans are a Three Sisters crop with corn and squash, and Virginia Extension lists nasturtiums as a squash companion. If you grow them near pumpkins, keep them at the edge of the patch. See what to plant with zucchini for the squash list.

What not to plant with pumpkins

Virginia Extension lists potatoes as incompatible with pumpkins, and its potato row lists pumpkins, squash and cucumbers as incompatible too. The practical reason is easy to see in the garden: potatoes need to be hilled during the season and dug at the end, and a mat of pumpkin vines makes both nearly impossible. Give potatoes their own bed; our potato guide lists better neighbors, and every pair to separate is in the keep-apart chart.

Give pumpkins room

UMN Extension notes that pumpkin and winter squash vines run along the ground and take up a lot of space. It spaces seeds 24 to 36 inches apart with rows 5 to 6 feet apart, using the closer spacing for bush types. In a small garden, choose a bush or semi-bush variety, or plant at the edge of the garden and train the vines out onto the lawn or a path. Small-fruited squash can be trellised, but UMN advises growing large-fruited types on the ground, since the fruit is too heavy for a trellis.

When to plant pumpkins

Pumpkins are planted after your last spring frost, once the soil is warm. UMN Extension says the seeds need soil of about 65°F at a 2-inch depth to germinate well; in Minnesota that means late May to early June. In short-season areas, you can start seeds indoors in pots at least 2 inches wide about four weeks ahead and transplant them, after hardening off, once the soil is warm. For a pumpkin ready by early fall, check the days to maturity on the seed packet and count back from your first fall frost. Our planting calendar shows the window for squash, which pumpkins share.

Planting and soil

• Depth: about three-quarters of an inch deep.
• Soil: moisture-retentive but well-drained soil; UMN gives a pH of about 6.0 to 6.5 for vine crops, and suggests raised beds or hills for good drainage.
• Compost: work in well-rotted manure or compost, and follow a soil test for fertilizer.
• Mulch: UMN advises waiting until the soil is at least 75°F before mulching with straw or compost, because mulch slows soil warming.

Watering and pollination

UMN Extension recommends at least an inch of water a week, soaking the soil thoroughly. Water at the base with a drip or soaker hose so the leaves stay dry, rather than using a sprinkler. Vine crops have shallow roots, so hoe weeds very shallowly and pull big ones by hand once the vines spread. Pumpkins need bees to move pollen from male to female flowers; UMN notes that cold, rainy, cloudy weather can reduce pollination and lead to poor fruit set.

A simple corn and pumpkin patch

1. Corn in a block on the north side.

   At least four short rows, planted after your last frost.

2. Pumpkin hills along the south edge of the block.

   Two or three seeds per hill, thinned to the strongest plant, 2 to 3 feet apart.

3. Train the vines into and around the corn rows.

   A listed companion pairing that also makes use of the space between stalks.

4. Marigolds at the corners.

   A listed pumpkin companion, placed where the vines will not smother them.

Keep potatoes in a different bed. Our raised bed layouts show how to plan beds by the square foot.

Harvest and curing

Pick pumpkins before a hard freeze. UMN Extension says a light frost that kills the vines will usually not harm the fruit. Cut the fruit from the vine with a few inches of stem attached, and handle it gently so you do not cut or bruise it. Then cure it, which dries and toughens the skin for longer storage: leave it in the field for a week or two of dry, sunny weather, or indoors in a warm (about 80°F), well-ventilated spot. Store cured pumpkins in a cool but not cold place, around 55°F, with good air movement, and check them often for soft spots.

Jack-o'-lantern or pie pumpkin?

UMN Extension notes that jack-o'-lantern pumpkins have stringy, bland flesh, while pie pumpkins are smaller and sweeter. The extremely large pumpkins grown for competition are a different species (Cucurbita maxima) from most jack-o'-lantern and pie types (C. pepo), so read variety descriptions carefully. Some varieties have hulless seeds that are nice for roasting but harder to grow in cool soil. Pick the type for how you plan to use it, and check the days to maturity against your season length.

Frequently asked questions

What grows well with pumpkins?

Extension-listed companions for pumpkins in our checker are corn and marigolds. The table on this page explains why each pairing works.

What should you not plant with pumpkins?

Our sources list potatoes (listed as incompatible in both directions; sprawling vines also get in the way of hilling and digging) as a poor neighbor for pumpkins.