Sweet Potato Companion Plants
Vegetable100 days to maturity
Sweet potatoes are tender, heat-loving vines grown as annuals for their sweet, starchy tubers, and despite the name they belong to the morning glory family rather than the nightshades like true potatoes. They are grown from slips rather than seed and sprawl across the ground as a dense living mulch that tolerates poor, sandy soil and drought once established. Their main threats come from below, where sweet potato weevils, wireworms, and root-knot nematodes scar and tunnel the developing roots.
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Tap any plant to see whether it pairs well with Sweet Potato and why. Green means a beneficial companion, red means keep them apart.
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Companion Planting Strategy for Sweet Potato
Because sweet potatoes are grown for their roots, the best companions either repel soil-dwelling pests like nematodes and weevils or share the bed without crowding the low, spreading vines. Aromatic herbs and pest-trapping flowers protect the tubers while light feeders coexist peacefully without robbing the soil.
Best Companion Plants for Sweet Potato
These plants grow well alongside Sweet Potato — providing pest control, attracting pollinators, or making better use of your garden space.
Bush beans fix nitrogen to support healthy vine growth and share bed space without crowding the low-running sweet potato foliage.
Peas fix nitrogen early in the cool part of the season and are typically harvested before the heat-loving sweet potatoes need the full bed.
Dill attracts parasitic wasps, ladybugs, and hoverflies that prey on aphids and other pests that bother the foliage.
Low-growing thyme works as an aromatic living mulch whose strong scent helps confuse and deter pests around the base of the plants.
Nasturtiums serve as a trap crop that pulls aphids and beetles away from the vines while their flowers attract pollinators and beneficial insects.
French marigolds suppress the root-knot nematodes that are one of the worst threats to sweet potato tubers, making them an especially valuable neighbor.
Beets are light feeders that draw from a different soil zone and usually finish earlier, so they share the bed without competing with the sweet potato roots.
What Not to Plant With Sweet Potato
Keep these away from Sweet Potato. They compete for resources, attract shared pests, or inhibit each other's growth.
Squash and other vining cucurbits are vigorous sprawlers that compete aggressively with sweet potatoes for ground space, sunlight, and nutrients, and their overlapping foliage traps disease-promoting humidity.
Tomatoes are heavy feeders that compete for nutrients, and both crops can host root-knot nematodes, so growing them together amplifies soil pest pressure on the tubers.
How to Grow Sweet Potato
- Botanical name
- Ipomoea batatas
- Family
- Morning glory family (Convolvulaceae)
- Sun
- Full sun, 6-8+ hours daily
- Water
- About 1 inch per week; drought tolerant once established, taper off water in the weeks before harvest
- Soil
- Loose, sandy, well-draining soil that is not overly rich in nitrogen, pH 5.5-6.5
- Spacing
- Set slips 12-18 inches apart in rows 3-4 feet apart, ideally on raised ridges
- Planting depth
- Plant slips so the lower nodes are buried 2-3 inches deep, leaving the top leaves above soil
- Germination
- Grown from slips (rooted sprouts coaxed from a stored tuber), not seed; slips root within 1-2 weeks of planting
- Days to maturity
- 90-120 days from transplanting slips
- When to plant
- Plant slips 3-4 weeks after the last frost, once soil is at least 65F and nights stay warm
- Harvest
- Dig before the first fall frost when leaves begin to yellow; cure at 80-85F and high humidity for 10-14 days to sweeten and toughen the skins
Common Sweet Potato Problems
Sweet potato weevil (tunnels in tubers, bitter taste, white grubs inside)
The most damaging pest. Plant certified weevil-free slips, rotate beds away from where you grew them last year, hill soil over exposed roots, and remove and destroy all crop debris after harvest.
Wireworms and white grubs (narrow holes and tunnels scarring the tubers)
These soil larvae are worse in beds recently in sod or grass. Rotate crops, work the soil to expose larvae to birds, harvest promptly once mature, and avoid planting into newly turned lawn.
Flea beetles (tiny shot-hole punctures in leaves; larvae scar tuber surfaces)
Use floating row covers on young plants, apply diatomaceous earth or neem to foliage, and keep the area weeded to reduce overwintering sites.
Root-knot nematodes (stunted vines, galled and cracked tubers)
Rotate with marigolds or grasses, add organic matter to boost beneficial soil life, and choose nematode-resistant varieties such as those bred for southern gardens.
Sweet Potato Companion Planting FAQ
What are the best companion plants for sweet potatoes?
Marigolds top the list because they suppress the root-knot nematodes that scar the tubers, and nasturtiums trap aphids while drawing in pollinators. Nitrogen-fixing beans and peas, plus aromatic herbs like dill and thyme and light-feeding beets, all share the bed without crowding the sprawling vines.
What should you not plant with sweet potatoes?
Avoid squash and other vining cucurbits, which compete aggressively for the same ground space, sunlight, and nutrients. Keep sweet potatoes away from tomatoes too, since both are heavy feeders that can host root-knot nematodes and amplify soil pest pressure when grown together.
Can you plant sweet potatoes and squash together?
It is not recommended. Both are vigorous, sprawling plants that quickly compete for ground space, light, and nutrients, and the dense overlapping foliage traps humidity that invites disease. Give each its own bed or trellis the squash so it does not smother the sweet potato vines.
When should you plant sweet potatoes?
Sweet potatoes love heat, so plant slips 3-4 weeks after your last spring frost once the soil has warmed to at least 65F and nights stay reliably warm. In cooler regions, use black plastic to warm the soil and raised ridges to give the roots the long, warm season they need.
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Plan Your Sweet Potato Garden
Use our interactive tools to design the perfect garden with Sweet Potato and its companions.