Sowing & Growing Sweet Potatoes

Sweet potatoes are an incredibly hearty & satisfying crop to grow, especially in Southern Appalachia. Their lush vines, nutritious roots, and long storage life make them a staple in many home gardens and homesteads. In Western North Carolina, where elevations, soil types, and microclimates can vary, it’s helpful to understand the best practices for sowing, growing, and harvesting sweet potatoes.

There’s a reason it is our state's official vegetable, yes really… that’s a thing, I checked.

I will walk you through everything you need to know to grow sweet potatoes successfully in our region: from choosing the right varieties to preparing the soil, planting slips (not seeds), and curing for long-term storage.

Choosing the Best Sweet Potato Varieties for Western North Carolina

The mountains of Western North Carolina are a biodiversity hotspot, so it makes sense that our growing zones range from 6b to 8a. Our summers are warm enough to grow excellent sweet potatoes, but mountain gardeners still benefit from choosing varieties that mature within roughly 90 to 110 days to stay ahead of potential early fall frosts.

Thankfully, there are plenty of great options that perform beautifully here. This season we’re growing a wide range of sweet potatoes, each with its own flavor, texture, color, and growth habit.

Beauregard remains one of the most reliable and widely loved varieties for home growers. It produces heavy yields of smooth, orange-fleshed roots with classic sweet potato flavor and stores exceptionally well.

O’Henry offers creamy white flesh with a slightly firmer texture and milder sweetness, making it excellent for roasting, fries, and savory dishes.

Vardaman is a favorite for smaller gardens and containers thanks to its compact, bush-type growth habit. Its golden flesh is rich and sweet, and the plants are easier to manage in tighter spaces.

Centennial is an old reliable heirloom variety with deep orange flesh, strong disease resistance, and dependable production in shorter mountain growing seasons.

Diana is another white-fleshed type prized for its smooth texture, mild sweetness, and excellent storage qualities.

Georgia Jet is known for very early maturity, sometimes producing harvestable roots in as little as 90 days. It’s especially helpful for higher elevations and shorter growing seasons.

Yellow Jewel produces golden flesh with smooth texture and dependable yields, offering something a little different from traditional orange varieties.

Purple Passion brings deep purple flesh packed with color and rich, earthy sweetness that holds beautifully when roasted or baked.

Right now at The Farm Connection, our sweet potato slips are ready for planting. Whether you’re growing for storage, baking, roasting, pies, or simply trying something new in the garden, there’s a variety here for every grower and every kitchen.

Soil Preferences and Bed Preparation

Sweet potatoes grow best in loose, well draining soil, with pH between 5.8 and 6.5. In Western North Carolina, where clay soil is common, amending the soil before planting is crucial (although I prefer to grow in 25 gallon fabric pots).

To prepare the ground:

Use raised beds or broad, low mounds to improve drainage and allow the soil to warm faster in spring.
Mix in aged compost, leaf mold, to loosen heavy soils and increase organic matter.
Avoid high-nitrogen fertilizers, which promote leafy vine growth at the expense of root development, instead focus on Phosphorous and Potassium forward mixes like our Remineralizing Blend.
If your native soil stays wet or heavy, consider growing in grow bags, containers, or beds built on a foundation of compost and sand.

Growing Sweet Potatoes From Slips

Sweet potatoes are not planted from seeds or cut tubers like regular potatoes. Instead, they are propagated from slips, which are shoots that grow from a mature sweet potato.

You can buy slips from us or start your own indoors:

In late winter or early spring, place a mature, untreated sweet potato in a jar of water or a shallow tray of damp sand. Keep it in a warm, sunny spot.
In a few weeks, sprouts will emerge. Once these shoots reach 6–8 inches long, gently twist them from the tuber.
Root the slips in water or plant them directly into moist soil outdoors after all danger of frost has passed.

In Western North Carolina, this typically means planting slips in mid to late May, once soil temperatures have reached at least 65°F.

While many gardeners enjoy saving and propagating their own slips year after year, there are some benefits to starting fresh with professionally grown slips each season. Over time, saved stock can gradually accumulate viruses, fungal issues, pest pressure, or off-type traits that reduce vigor, yields, and reliability. Sweet potatoes are propagated clonally, so any problems present in the parent plant tend to carry forward generation after generation. Starting with healthy, vigorous slips each season often means cleaner genetics, stronger growth, improved disease resistance, and more dependable harvests overall.

Planting Guidelines

When planting your slips, space them 12 to 18 inches apart in rows spaced about 3 feet apart. This allows each plant enough room to sprawl and form healthy roots.

Sweet potatoes require:

Full sun, with at least six to eight hours of direct sunlight daily.
Consistent moisture, especially during the first few weeks after transplanting. About one inch of water per week is ideal.
Mulch, which helps regulate soil temperature, retain moisture, and reduce weed pressure. Use straw, leaf mulch, or black plastic.

Keep in mind that sweet potatoes are vining plants and will spread out widely unless trellised or contained in beds or bags.

Growing in Small Spaces

Sweet potatoes adapt well to container growing, which is ideal if your soil is too rocky or clay-heavy. Use a 15-gallon or larger grow bag for each plant and fill it with a good premixed soil like ProMix or Daddy Pete's. At our store front right now we are stocked up with multiple sizes of fabric pots, ideal for container growing as they are plastic free and reusable. I’d recommend 3-4 slips in a bag of 20 or 25 gallons to ensure healthy root growth.

Bush varieties like Vardaman are ideal for containers, but any compact or early-maturing variety will do well. Place containers in a sunny location and keep them consistently watered.

Companion Planting with Sweet Potatoes

Even sweet potatoes get by with a little help from their friends. I am a big believer in companion planting as it's a free and easy way to maximize soil health. Sweet potatoes benefit from several companion plants that help deter pests, improve soil fertility, or attract beneficial insects.

Good companions include:

Bush beans: Fix nitrogen in the soil and help support healthy vine growth.
Spinach and lettuce: Can be interplanted early in the season before vines spread.
Dill: Attracts beneficial insects and may help deter pests.
Marigolds and nasturtiums: Help repel root-knot nematodes and other insect pests.
Alyssum: A great pollinator plant that draws in hoverflies and parasitic wasps.

Avoid planting near:

Tomatoes: They share some pests and fungal diseases with sweet potatoes.
Cucumbers and squash: These crops compete for space and nutrients and can encourage fungal spread in crowded gardens.

Pest and Disease Prevention

Sweet potatoes are generally hardy but can face a few pests and disease challenges:

Wireworms and root-knot nematodes: These can damage roots underground. Crop rotation and adding beneficial nematodes to the soil can help.
Flea beetles and sweet potato weevils: Look for tiny holes in foliage or damage to vines. Mulching and planting trap crops can reduce issues.
Fungal rots: Avoid overwatering and make sure soil drains well. Start with certified disease-free slips to minimize problems.

One of the most effective strategies is rotating crops each year, ideally on a three- to four-year cycle. Avoid planting sweet potatoes where other root crops (especially from the morning glory family) have grown recently.

Harvesting and Curing Sweet Potatoes

Sweet potatoes are usually ready to harvest 90 to 110 days after planting, or when leaves start to yellow and die back.

To harvest:

Loosen soil around the base of each plant with a garden fork or spade, or your hands... I'm not going to judge you.
Gently lift the roots out, being careful not to bruise or cut them.
Shake off loose soil but do not wash the roots yet.
If container growing, like I do, just dump your fabric pot or grow bag onto a tarp, and collect your sweet potatoes. No accidental forking or leaving tubers behind!

After harvest, cure the roots in a warm (80°F), humid (85–90% humidity) environment for 5 to 10 days. This helps thicken the skins and converts starches to sugar, improving flavor and shelf life. Once cured, store sweet potatoes in a cool (55–60°F), dark, and dry area with good ventilation. A cardboard box with a lid and a few holes in it works just fine Do not refrigerate raw sweet potatoes, as cold temperatures can ruin their texture and sweetness.

Finally

Sweet potatoes are an adaptable, low-maintenance crop with high rewards. Whether you grow them in mounds, containers, or raised beds, these versatile roots offer food security, nutritional value, and garden beauty all season long.