How to Grow Sweet Potato
Ipomoea batatas
Sweet potatoes are warm-season root vegetables prized for their sweet flavor and versatile culinary uses. Gardeners grow them for their vibrant orange flesh that thrives in long, hot summers. These vines spread widely, making them an excellent choice for containers or large garden beds.
📷 Wikipedia: Sweet potatoStarting Sweet Potato: indoors or direct sow?
🌾 Sow directly in the garden — Sweet Potato is not usually started indoors.
Do not transplant sweet potato seedlings; instead, plant purchased slips directly into the garden after all danger of frost has passed and soil is warm.
Soil, care & harvest
Prepare loose, well-draining soil with a pH between 5.5 and 6.5 to encourage strong root development. Since sweet potatoes are frost-sensitive warm-season crops, plant slips outdoors only after the last spring frost when soil temperatures reach at least 60°F. Do not sow seeds indoors or directly into cold ground; instead, start by purchasing certified disease-free slips in late spring once the danger of frost has completely passed.
Space plants 12 to 18 inches apart to allow vines to spread up to six feet without overcrowding. These crops do not require trellising as they grow low to the ground. Provide moderate water consistently, but reduce irrigation significantly two weeks before harvest to prevent rotting tubers. Apply a light layer of straw mulch around plants to retain moisture and suppress weeds while keeping vines off the soil.
Watch for aphids and sweet potato whiteflies which can be managed with insecticidal soap or by encouraging beneficial insects like ladybugs. Powdery mildew may appear in humid conditions; improve air circulation to prevent this fungal issue. Harvest roots 90 to 120 days after planting slips when foliage begins to yellow. Dig carefully around the base, cure them in a warm, dry place for a week, then store in a cool, dark location.
When to Plant Sweet Potato
Planting windows vary by USDA hardiness zone. Look up yours by ZIP code.
| Zone | Start Indoors | Direct Sow | Harvest |
|---|---|---|---|
| Zone 1 | — | June – July | September |
| Zone 2 | — | May – July | September |
| Zone 3 | — | May – June | August – October |
| Zone 4 | — | April – June | August – October |
| Zone 5 | — | April – May | July – November |
| Zone 6 | — | April – May | July – November |
| Zone 7 | — | March – May | July – November |
| Zone 8 | — | March – April | June – December |
| Zone 9 | — | February – March | May – December |
| Zone 10 | — | January – March | May – December |
| Zone 11 | — | January – February | April – December |
| Zone 12 | — | January – February | April – December |
| Zone 13 | — | January – February | April – December |
