Growing sweet potatoes is easier than most gardeners think—if you follow the right steps. Whether you’re planting in raised beds, containers, or garden rows, sweet potatoes thrive with warmth, loose soil, and consistent care. This guide gives you everything you need to grow sweet potatoes successfully, from sprouting slips to harvesting tubers like a pro.
Quick Answer: How to Grow Sweet Potatoes in 5 Simple Steps
- Start with slips: Buy certified disease-free slips or grow your own from a sweet potato.
- Choose the right spot: Full sun (6–8 hours daily) and well-draining, sandy soil.
- Plant after frost: Wait until soil is at least 60°F (15°C)—usually late spring.
- Space properly: Plant slips 12–18 inches apart in rows 3–4 feet apart.
- Harvest at the right time: Dig up tubers 90–120 days after planting, before the first frost.
Why Grow Sweet Potatoes? The Benefits You Can’t Ignore
Sweet potatoes aren’t just delicious—they’re nutrient powerhouses packed with vitamin A, fiber, and antioxidants. Unlike regular potatoes, they’re low on the glycemic index when eaten in moderation, making them a smart choice for health-conscious gardeners. Plus, they store well for months, giving you fresh, homegrown food all winter.
They’re also incredibly versatile in the kitchen—roast them, mash them, turn them into fries, or bake them into pies. And let’s be honest: there’s something deeply satisfying about pulling up a mound of golden-orange tubers you grew yourself.
How to Grow Sweet Potatoes: Step-by-Step Instructions
Step 1: Get Your Sweet Potato Slips
Sweet potatoes aren’t grown from seeds—you need sweet potato slips, which are small sprouts that grow from a mature tuber. You can buy them online or from garden centers, or grow your own at home.
To grow slips yourself:
- Place a sweet potato (organic is best) half-submerged in water using toothpicks.
- Keep it in a warm, sunny spot (70–80°F or 21–27°C).
- In 4–6 weeks, green shoots will appear. Once they’re 6–8 inches long, gently twist them off.
- Place the slips in water to root for a few days before planting.
Step 2: Prepare the Soil
Sweet potatoes love loose, well-draining soil with a slightly acidic pH (5.8–6.2). Heavy clay or compacted soil leads to misshapen tubers.
Amend your garden bed with:
- Compost or aged manure (2–4 inches worked into the top 12 inches)
- Sand or perlite if drainage is poor
- Avoid fresh manure or high-nitrogen fertilizers—they promote leafy growth, not tubers
Raised beds or mounded rows work best. Create 8–10 inch high mounds spaced 3–4 feet apart to improve drainage and warmth.
Step 3: Plant at the Right Time
Sweet potatoes are heat-loving crops. Wait until all danger of frost has passed and the soil has warmed to at least 60°F (15°C). In most regions, this means planting in late May or early June.
Plant slips 12–18 inches apart in the mounds, burying them up to the first few leaves. Water gently after planting to help roots establish.
Step 4: Water and Feed Wisely
Water deeply but infrequently—about 1 inch per week. Too much water causes rot; too little leads to cracking. Use drip irrigation or soaker hoses to keep moisture consistent without wetting the leaves.
Fertilize lightly at planting with a balanced, low-nitrogen fertilizer (like 5-10-10). Avoid high-nitrogen formulas—they’ll give you lush vines but few tubers.
Side-dress with compost or a potassium-rich fertilizer (like kelp meal) once vines begin to spread.
Step 5: Weed and Mulch
Keep the area weed-free, especially in the first 6 weeks. Weeds compete for nutrients and water.
Apply a 2–3 inch layer of straw or shredded leaves as mulch. This conserves moisture, suppresses weeds, and keeps soil temperature stable.
Step 6: Harvest at the Right Time
Most sweet potato varieties mature in 90–120 days. Watch for yellowing leaves—that’s your cue to harvest.
Use a garden fork to gently loosen the soil around the plant. Lift the tubers carefully to avoid bruising. Don’t pull on the vines—this can damage the roots.
Cure harvested sweet potatoes in a warm (85°F or 29°C), humid place for 7–10 days. This heals minor cuts and boosts sweetness and storage life.
Common Mistakes When Growing Sweet Potatoes
Even experienced gardeners make these errors:
- Planting too early: Cold soil stunts growth and increases rot risk.
- Overwatering: Leads to splitting and fungal diseases.
- Using heavy soil: Causes deformed tubers.
- Fertilizing with too much nitrogen: Results in leafy vines and small potatoes.
- Harvesting too late: Frost kills vines and can damage tubers.
Pro Tips for Bigger, Better Sweet Potatoes
- Choose the right variety: ‘Beauregard’ and ‘Covington’ mature fast and resist disease. ‘Jewel’ has great flavor and stores well.
- Use black plastic mulch: Warms the soil and suppresses weeds—ideal in cooler climates.
- Rotate crops: Don’t plant sweet potatoes in the same spot more than once every 3 years to prevent soil-borne diseases.
- Save your best tubers for next year: Set aside healthy, unblemished potatoes to grow into slips for next season.
Can You Grow Sweet Potatoes in Containers?
Absolutely! Sweet potatoes grow well in large containers—just choose a deep pot (at least 18 inches deep and 24 inches wide) with good drainage.
Use a lightweight potting mix amended with compost. Plant 2–3 slips per container. Water more frequently than in-ground plants, but avoid soggy soil.
Container growing is perfect for small spaces, patios, or urban gardens. Just remember: containers heat up faster, so monitor soil temperature and provide afternoon shade in hot climates.
Key Takeaways
- Grow sweet potatoes from slips, not seeds.
- Plant in warm, loose, well-draining soil after the last frost.
- Water deeply but infrequently; avoid high-nitrogen fertilizers.
- Harvest 90–120 days after planting, before frost.
- Cure tubers for better flavor and longer storage.
FAQ: Frequently Asked Questions
How long does it take to grow sweet potatoes?
Most varieties take 90 to 120 days from planting to harvest. Check the seed packet or plant tag for the specific maturity time of your variety.
Can I grow sweet potatoes from store-bought ones?
Yes, but only if they’re organic. Conventional sweet potatoes are often treated with sprout inhibitors. Organic ones are more likely to produce healthy slips.
Do sweet potatoes need full sun?
Yes—sweet potatoes require at least 6–8 hours of direct sunlight per day for optimal growth and tuber development.
How do I know when sweet potatoes are ready to harvest?
The vines will start to yellow and die back. This usually happens 90–120 days after planting. Dig carefully around the base to check tuber size—most are ready when they’re 3–5 inches long.
Can sweet potatoes be grown in cold climates?
Yes, but they need a long, warm growing season. Use black plastic mulch to warm the soil and consider early-maturing varieties like ‘Beauregard’ (90 days).
Final Thoughts: Grow Sweet Potatoes with Confidence
Growing sweet potatoes is a rewarding experience that delivers delicious, nutritious results. With the right preparation, timing, and care, even beginner gardeners can enjoy a rich harvest of homegrown tubers.
Start with quality slips, give them sun and space, and avoid overwatering. Follow these steps, and you’ll be enjoying roasted, mashed, or baked sweet potatoes from your own backyard in no time.
Ready to dig in? Grab your shovel, pick a sunny spot, and start growing sweet potatoes today.