How to Grow Sweet Potatoes from Slips: Step-by-Step Guide

Sweet potatoes don’t grow from seeds like many other vegetables. They grow from slips, which are sprouts that come from a mature sweet potato. You can grow your own slips at home in water or soil and use them to produce a full crop of sweet potatoes.

Starting slips is simple and requires only a healthy sweet potato, some water or soil, and a bit of patience. Once the slips are a few inches long and have roots, you can transplant them into warm soil outdoors and watch them grow into productive plants.

By learning how to grow slips yourself, you gain control over variety, quality, and timing. This method also helps you save money compared to buying slips each season while ensuring your plants are strong and ready for harvest.

Key Takeaways

• Sweet potatoes grow from slips, not seeds
• You can start slips at home in water or soil
• Healthy slips lead to a strong harvest

Understanding Sweet Potato Slips

Sweet potato slips are the key to starting new plants since sweet potatoes do not grow from seeds like many other vegetables. By understanding what slips are, why they matter, and how to choose the right variety, you can set yourself up for a healthy and productive harvest.

What Are Sweet Potato Slips

Sweet potato slips are young shoots that sprout from a mature sweet potato tuber. Unlike regular potatoes, which grow from “eyes,” Ipomoea batatas produces slips that must be rooted before planting. Each slip grows into a full plant capable of producing its own tuberous roots.

You usually grow slips by placing a sweet potato in water or soil until sprouts form. Once these sprouts reach about 4–6 inches, you remove them and root them in water or directly in soil. This step ensures they develop into strong seedlings before moving into the garden.

Because sweet potatoes belong to the morning glory family, the slips grow as vines with heart-shaped leaves. This makes them different from other root crops like carrots or beets. A single sweet potato can produce dozens of slips, giving you multiple plants from one tuber.

Benefits of Growing from Slips

Growing from slips ensures you start with clean, vigorous plants rather than relying on uncertain tubers. Since slips are cuttings, they reduce the risk of spreading soil-borne diseases that may affect stored roots. This method also allows you to control the number of plants you want to grow.

Slips adapt well to garden soil once rooted, and each slip can yield several mature sweet potatoes. On average, one slip produces about five to six tuberous roots, though this depends on soil quality, temperature, and care.

Another benefit is flexibility. You can start slips indoors in water or soil weeks before the growing season begins. This gives you a head start so your plants are ready when outdoor temperatures reach at least 60°F. For step-by-step instructions, you can review how to grow sweet potato slips in water or soil.

Choosing Sweet Potato Varieties

Not all sweet potato varieties perform the same in every climate. Some are bred for shorter growing seasons, while others need a long, hot summer to reach full size. When choosing slips, consider your region’s frost dates and soil conditions.

Common varieties include Beauregard, which matures quickly and produces high yields, and Covington, known for its uniform shape and sweet flavor. If you live in cooler regions, look for varieties that mature in about 90 days rather than the standard 120.

It’s best to start with organic sweet potatoes since many grocery store tubers are treated with sprout inhibitors. Using untreated roots ensures your slips sprout reliably. For more guidance, you can explore tips on selecting the right sweet potato varieties for slips.

By matching the right variety to your climate and soil, you increase your chances of a steady harvest of healthy, well-formed tuberous roots.

How to Grow Sweet Potato Slips

You can grow sweet potato slips from a single tuber using simple methods. The process involves choosing the right potato, starting growth in either water or soil, and then rooting the sprouts before planting them outside.

Selecting and Preparing Sweet Potatoes

Start with a healthy, firm sweet potato. Choose an organic sweet potato when possible because many conventional ones are treated with sprout inhibitors that prevent propagation.

Pick a medium-sized potato without cuts or soft spots. Larger potatoes can produce more slips, but avoid oversized ones that may rot more easily.

Before starting, wash the potato well to remove any dirt. You can cut a large potato in half if needed, but many gardeners prefer to use whole potatoes to reduce rot risk.

For best results, begin the process about 6–8 weeks before your last expected frost date. This gives enough time for slips to grow roots and be ready for transplanting into warm soil.

Water Method for Growing Slips

The water method is simple and works well indoors. You’ll need a glass jar, clean water, and toothpicks.

Insert toothpicks around the middle of the potato to suspend it over the jar. Place the tapered end in the water so that about half of the potato is submerged. Set the jar in a warm, sunny window.

Change the water every few days to prevent mold or bacteria. After 2–3 weeks, roots will form in the water, and green sprouts will grow above the surface.

Once sprouts reach 4–5 inches long, twist them off carefully. Place these slips in fresh water until they develop their own root systems. Each rooted slip can then be transplanted into the garden. For step-by-step details, you can follow this guide to growing sweet potato slips in water.

Soil Method for Growing Slips

The soil method produces strong slips and can be done indoors or outdoors in warm climates. Use a shallow container with drainage holes and fill it with moist potting soil.

Bury the bottom half of the potato lengthwise into the soil. Keep the soil evenly moist but not soggy. Place the container in a warm spot with plenty of sunlight or use a grow light if needed.

In 1–2 weeks, roots will form underground, and shoots will appear above the soil. When the slips reach 4–5 inches, cut or twist them off at the base.

If slips already have roots attached, you can plant them directly. If not, place them in water for a few days until roots form. Learn more about the soil method for growing sweet potato slips if you want an alternative to the water method.

Planting and Caring for Sweet Potato Slips

Sweet potato slips need strong roots, warm soil, and careful handling to grow into healthy plants. Paying attention to rooting, timing, and spacing gives you the best chance of a good harvest.

Rooting and Hardening Off Slips

Once your slips reach 4–6 inches long, you should root them in water or moist soil. Place the slips in a jar of clean water, making sure at least one or two leaf nodes are submerged. Roots usually appear within a few days.

After roots form, keep the slips in bright light and change the water often to prevent rot. If you rooted them in soil, keep the soil evenly moist but not soggy.

Before planting sweet potato slips outside, you need to harden them off. Set them outdoors in a sheltered spot for a few hours each day, gradually increasing sun exposure over a week. This reduces transplant shock and helps the plants adjust to garden conditions.

Healthy slips should have strong white roots and several leaves before they are ready for the garden. Weak or wilted slips are less likely to thrive.

Best Time to Plant Sweet Potato Slips

Sweet potatoes are a warm-season crop that grows best when soil is consistently warm. Wait until nighttime temperatures stay above 60°F and soil warms to at least 65°F. Planting too early can stunt growth or kill young vines.

In most regions, slips go into the ground about 3–4 weeks after the last frost date. If you live in a cooler climate, consider using raised beds or black plastic mulch to warm the soil faster.

Sweet potatoes need a long growing season of about 90–120 days. Planning your planting date with this in mind ensures the crop has enough time to mature before frost returns.

If your season is short, you can extend it by starting slips indoors earlier and transplanting once conditions are right.

Transplanting Slips into the Garden

When transplanting, space each slip 12–18 inches apart in rows about 3 feet apart. This gives vines room to spread and roots space to develop.

Plant slips deep enough to cover the roots and at least one set of leaf nodes. Firm the soil around each slip and water well to settle the roots.

Choose a sunny location with loose, well-drained soil. Heavy clay or compacted soil can cause misshapen roots. Adding compost improves drainage and provides nutrients.

During the first week, keep the soil consistently moist. In hot weather, provide temporary shade with row covers or overturned pots to prevent wilting.

Weed carefully around young plants, as shallow cultivation protects the developing roots. Once vines spread, they help shade the soil and reduce weed growth.

For more detailed steps on transplanting slips, you can review this guide on planting sweet potato slips in the ground.

Harvesting and Storing Sweet Potatoes

You need to handle sweet potatoes with care when removing them from the soil and during storage. Proper timing, gentle harvesting, and curing are key steps that protect the tuberous roots and help them last for months.

Signs of Maturity and Harvesting

Sweet potatoes are usually ready to dig about 90–120 days after planting, depending on the variety. A clear sign of maturity is when the vines begin to yellow and die back. You should also harvest before the first hard frost, since cold soil can damage the roots.

Cut back the vines a few days before digging to make harvesting easier. Use a garden fork or spade to loosen the soil 18 inches around and 4–6 inches deep. This prevents you from slicing into the tuberous roots.

Lift the crown carefully and pull the roots by hand. Handle each sweet potato gently because they bruise easily. Do not wash the roots at this stage; instead, brush off excess soil.

If you want more details on timing and techniques, check the harvest guide from Almanac.

Curing and Storing Your Harvest

Curing sweet potatoes is essential because it improves flavor and helps small cuts heal. Place the roots in a warm, humid area at about 80°F and 85–90% humidity for 7–14 days. A shaded table outdoors or a warm indoor space with good airflow works well.

After curing, sort through and remove any bruised or damaged roots. Wrap healthy roots in newspaper or place them in a basket or wooden box. Store them in a cool, dark space at 55–60°F with good ventilation.

Properly cured and stored sweet potatoes can last up to six months. For more step-by-step curing and storage methods, see Tenth Acre Farm’s storage guide.

Frequently Asked Questions

You can start sweet potato slips in soil or water, then move them into the garden once they have roots. Proper spacing, careful cutting, and choosing the right growing method are key for healthy plants and good harvests.

What is the process for starting sweet potato slips indoors?

Place mature sweet potatoes halfway into moist potting soil inside a tray or shallow container. Keep the container in a warm, sunny spot or under a grow light. Within a couple of weeks, sprouts will appear that you can later remove and root in water before planting.

Can you explain how to plant sweet potato slips in the ground?

Wait until soil temperatures reach at least 65°F. Plant slips 12 to 18 inches apart in rows about 3 feet apart. Cover the roots with soil and water well to help them establish. In hot weather, provide light shade to protect young slips from wilting.

What are the steps for cutting sweet potato slips for planting?

When sprouts reach 4 to 6 inches long, twist or cut them off at the base of the potato. Remove the lower leaves so only the top leaves remain. Place the cut slips in water until roots form, then transplant them into soil.

How do you grow sweet potato slips in water?

Suspend a sweet potato in a glass of water with toothpicks so half of it stays submerged. Roots will grow underwater while shoots appear above. Once the shoots reach about 4 to 5 inches, remove them and place them in fresh water until they form roots for planting.

What are the best practices for growing sweet potatoes in containers?

Use a large container at least 18 inches deep with good drainage. Fill it with loose, sandy soil or a well-draining potting mix. Plant slips near the center, water regularly, and provide full sun. Containers should allow enough space for tubers to expand without crowding.

Is it possible to grow sweet potatoes in water, and if so, how?

You can grow slips in water, but the full crop requires soil. Keep a sweet potato half-submerged in water to produce sprouts and roots. Once slips root in water, transfer them to soil for proper growth and tuber development. For details, see this guide on growing sweet potato slips in water.