Sweet potatoes are one of the most rewarding vegetables you can grow at home, and they do surprisingly well in containers. With long, sweet, nutritious tubers and beautiful trailing vines, sweet potatoes work beautifully on patios, balconies, and small gardens. Container growing also makes harvesting easy and helps you control soil quality and pests. Whether you have lots of space or just a sunny corner, you can grow your own sweet potatoes successfully.
Here is your complete step by step guide to growing sweet potatoes in containers.
Why Grow Sweet Potatoes in Containers
Sweet potatoes thrive in containers for several reasons:
- They fit easily in small spaces.
- Containers warm up faster, which sweet potatoes love.
- You can move them to follow the sun.
- Harvesting is much easier than in ground.
- It is a fun and productive project for any gardener.
Even one large container can produce several pounds of sweet potatoes.
Choose the Right Variety
Some sweet potato varieties work especially well in containers:
- Beauregard: Reliable, productive, and widely available.
- Centennial: Excellent for short growing seasons.
- Vardaman: Compact bush variety, great for small pots.
- Murasaki: Purple skinned variety with sweet white flesh.
Bush types take up less space, while vining types reward you with bigger harvests.
Pick the Right Container
Sweet potatoes need plenty of room for their tubers to grow:
- Use a container at least 16 to 20 inches deep.
- Choose a pot 18 to 24 inches wide.
- Make sure it has plenty of drainage holes.
- Fabric grow bags are ideal for breathability.
Larger containers always lead to bigger harvests.
Use the Right Soil
Sweet potatoes love loose, sandy soil that drains well:
- Mix half potting soil with half compost.
- Add a handful of sand for drainage.
- Aim for a pH between 5.8 and 6.5.
- Skip heavy garden soil, which compacts in pots.
Loose soil makes it easier for tubers to grow large and smooth.
How to Get Sweet Potato Slips
Sweet potatoes are grown from slips, which are small shoots that sprout from a mature sweet potato. You can buy slips from a nursery or grow your own:
- Place a sweet potato in water with toothpicks holding it up.
- Wait several weeks for shoots to grow from the top.
- When shoots are 4 to 6 inches tall, gently twist them off.
- Place them in water until roots form, then plant.
Each sweet potato can produce many slips, giving you a lot of plants from one tuber.
How to Plant Sweet Potatoes
Plant sweet potatoes in early summer when soil temperatures stay above 65 degrees Fahrenheit:
- Fill the container with soil mix.
- Plant slips 3 to 4 inches deep.
- Space them 12 inches apart.
- Water deeply right after planting.
If frost is still possible, wait until the weather is warm and stable.
Sunlight and Placement
Sweet potatoes love sun. Place containers in a location with at least 6 to 8 hours of direct sunlight per day. Less sun means smaller, slow growing tubers.
Watering Sweet Potatoes
Container sweet potatoes need consistent watering:
- Water deeply when the top inch of soil dries.
- Avoid letting the pot dry out completely.
- Reduce watering 2 to 3 weeks before harvest for better flavor.
- Mulch the surface to keep moisture even.
Steady moisture leads to plump, flavorful tubers.
Feeding Your Plants
Sweet potatoes do not need heavy feeding, but a light feed every 4 weeks supports steady growth. Use a balanced fertilizer or compost tea. Avoid high nitrogen feeds, which encourage lots of vines but few tubers.
Caring for the Vines
Sweet potato vines spread quickly and look beautiful. Train them around the pot or let them trail. You can also grow them on a trellis to save space. Healthy vines mean healthy tubers underground.
Common Problems and Solutions
- Yellow leaves: Often nutrient deficiency.
- Few tubers: Caused by too much nitrogen or shaded plants.
- Slow growth: Cool soil or low light.
- Pests like aphids: Spray with soapy water.
When to Harvest Sweet Potatoes
Sweet potatoes are ready 90 to 120 days after planting. Look for these signs:
- Vines start yellowing or wilting.
- Tubers reach full size.
- Cooler weather signals harvest time.
Harvest before the first hard frost, since cold can damage the tubers.
How to Harvest
Gently tip the container onto a tarp and dig through the soil. Be careful not to bruise the tubers, since damaged sweet potatoes do not store well. Brush off the soil but do not wash them yet.
Curing for Better Flavor
Sweet potatoes need to be cured for the sweetest flavor. Place them in a warm, humid spot for 7 to 10 days. After curing, store them in a cool, dry place. Properly cured sweet potatoes can keep for 4 to 6 months.
Final Thoughts
Growing sweet potatoes in containers is a fun, productive, and easy project for any home gardener. With the right pot, soil, and care, you can enjoy a sweet, satisfying harvest from a small space. They are also delicious in countless recipes, from baked dishes to fries and casseroles.
Plant a few slips this season, follow these tips, and enjoy the joy of growing your own sweet potatoes from start to finish.
