Sweet potato
Also known as
Sweetpotato, Sweet potato vine, Ornamental sweet potato, Kumara, Camote, Batata
Keep this plant’s care guide close at hand.
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Ipomoea batatas, commonly known as sweet potato, is a vigorous, twining or trailing perennial vine in the morning glory family (Convolvulaceae) grown both for its edible storage roots and its ornamental foliage. Plants form long, creeping stems that root at nodes, with heart- to lobed-shaped leaves that vary widely in color and form among cultivars—ranging from lime-green to deep purple and variegated patterns. Funnel-shaped, pale lavender to pink flowers appear sporadically, more often under short days and warm conditions, but are not essential for production. Storage roots develop along underground stems in loose, warm soils. As a warm-season crop, sweet potato thrives in full sun, heat, and consistent moisture, yet tolerates brief dry spells once established. Ornamental selections excel as fast-growing groundcovers or container spillers, while vegetable cultivars are managed in beds for high-quality roots. Easy to propagate from slips, cuttings, or tuber pieces, the species is adaptable but sensitive to frost and cold, which can blacken foliage and injure roots.
Taxonomy
Properties & Requirements
How to care for Sweet potato
Water
Provide deep, even moisture, about 2.5–4 cm (1–1.5 in) per week, more in sandy soils or containers. Water when the top 2–4 cm of soil dries, then soak thoroughly; avoid constant sogginess, which invites rot and misshapen roots. Mulch to moderate soil temperature and conserve moisture. Reduce irrigation in the final 1–2 weeks before harvest to improve curing and limit splitting. Water early in the day to keep foliage dry and lower disease pressure.
Light
Provide full sun for best vigor and root yield: 6–8+ hours of direct light daily. In very hot climates, light afternoon shade prevents leaf scorch and slows excessive transpiration, especially in containers. Indoors, place near a bright south or west window or supplement with 12–14 hours of grow lights. Lower light reduces growth and dulls foliage color in ornamental cultivars, and can diminish root production in edible types.
Nutrients
Sweet potatoes prefer lean, well-amended soils; excessive nitrogen promotes vines at the expense of roots. Before planting, incorporate compost or a balanced, low-nitrogen fertilizer (e.g., N-P-K around 3-4-4 or 5-10-10). Side-dress 3–5 weeks after transplanting with additional potassium and phosphorus to support root bulking. In containers, feed every 2–4 weeks at half strength. Always soil-test if possible and avoid chloride-heavy potassium sources; maintain even nutrition rather than frequent, high doses.
Temperature
Sweet potato is frost-tender and thrives in sustained warmth. Optimal air temperatures are 21–29°C (70–85°F), with soil above 18°C (65°F) for planting. Growth stalls below ~15°C (59°F) and foliage can be injured below 10–12°C (50–54°F); roots suffer chilling injury in cold, wet soils. Protect from any frost and extend the season with black plastic or row covers in cool climates. Indoors, keep above 16°C (60°F) and away from cold drafts.
