Sweet Potato
A sprawling, sun-loving vine that rewards patience with a buried treasure of sweet, starchy roots in shades of orange, purple, and cream.
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More Than a Side Dish
Sweet potato is one of the world's oldest cultivated crops, with origins tracing back at least 5,000 years to the Andes of South America. It spread across Polynesia and into Asia long before European contact - a feat of ancient seafaring still debated by botanists today. Despite sharing a name, it is no relation to the common potato; it belongs to the morning glory family and will even produce showy lavender blooms under the right conditions.
Roots range from dry and starchy to moist and almost custardy depending on the variety. 'Beauregard' and 'Jewel' are the classic orange-fleshed types most common in grocery stores, while 'Stokes Purple' and 'Japanese' offer earthy, dense flesh ideal for roasting. The edible leaves are a nutritious bonus - harvested young, they taste mild and slightly spinach-like and are prized in West African and Asian cuisines.
Planting & care
Start sweet potatoes from slips - rooted cuttings sprouted from a mature tuber - rather than seed. Set slips out 2-3 weeks after your last frost date, once soil has warmed to at least 65 degrees F. Space plants 12-18 in apart in rows 3-4 ft wide, in loose, well-drained soil amended with compost but low in nitrogen (excess nitrogen pushes leafy growth at the expense of roots). A raised bed or mounded row aids drainage and helps soil warm quickly.
Water consistently for the first month to establish vines, then ease off - overwatering late in the season leads to cracked or rotted roots. Avoid cultivating deeply near plants once vines spread, as you risk slicing developing tubers. Stop watering entirely about a week before harvest. Cure freshly dug roots at 85-90 degrees F with high humidity for 10-14 days; this converts starches to sugars and heals any nicks in the skin, dramatically improving flavor and extending storage life.
Don't Rush the Dig
Harvest before the first frost - cold soil below 55 degrees F damages roots - but push as close to that date as you can. Every extra week of warmth adds meaningful size and sweetness. After curing, sweet potatoes store well for 6-12 months in a cool, dark spot around 55-60 degrees F. Never refrigerate uncured roots; cold temperatures turn the flesh hard and unpleasantly starchy.
How much sun does Sweet Potato need?
Sweet Potato grows best in full sun.
How often should you water Sweet Potato?
Give it about 1 in per week; reduce as vines mature.
When is Sweet Potato ready to harvest?
Sweet Potato is usually ready in 90-120 days from transplant.