GardenSweet potato variety
Okinawan Sweet potato
✓ In your garden
Okinawan is a purple-fleshed sweet potato, ready in about 120–140 days. You grow sweet potatoes from “slips” — rooted sprouts — not seed or tubers. Plant them once the soil is warm, give them a long, hot summer to sprawl, and dig before frost. Then cure them warm for a week or two, which heals the skins and turns the flesh sweet.
“A heat-loving root that cures sweet and stores for months.”
Growing basics — shared by every sweet potato
Okinawan grows like any other sweet potato. The full picture — how deep to plant, spacing, feeding, pests, harvest — lives on the Sweet potato page so it's maintained in one place.
- Sun
- Full Sun
- Spacing (in row)
- 9–15 in
- Row spacing
- 36–48 in
- Planting depth
- 3–5 in
- Soil pH
- 5.5–6.5
- Water
- Moderate
What is Okinawan good for?
- Baking & roastingCaramelizes sweet. Great
- Mash & pieSilky and sweet. Great
- FriesCrisp them hot. Great
From how it grows — kitchens vary.
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Want the full 10/50/90% odds + nearest stations? Open the frost tool →When to plant Okinawan in your zone
Zone 6bGreenhouse or cover on: your start slides ~4 weeks earlier and your harvest stretches ~3 weeks later (shown striped).
Planting seeds straight in the ground only works where the season's long and warm — most gardeners start seeds indoors or buy young plants, or you'd pick your first tomato right as frost hits.
Comfortable — first ripe fruit lands around late Aug, well before your typical frost (~late Oct).
- Toughen up outside
- late Apr – early May
- Move plants outside
- early May – mid May
- Growing
- mid May – late Aug
- Picking
- late Aug – early Oct
Typical dates for zone 6b — set your zone or ZIP above for yours.
Growing Okinawan — the things that trip people up
- Sweet potatoes grow from slips — rooted sprouts you buy or start from a tuber. Plant them only once both the air and soil are warm; they’re tropical and won’t move in the cold.
- Dig carefully before the first frost (frost damages the roots), then cure them for a week or two somewhere warm and humid. Curing heals nicks, sweetens the flesh, and lets them store for months.
Okinawan sweet potato at a glance
| Type | Purple |
|---|---|
| Days to ripe | 120–140 days after you plant it outside |
| Color | Purple |
Extra fields from seed-catalog listings and university growing guides. Days to ripe and disease resistance shift with your climate and seed source — double-check with your local extension office before you buy.
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Common questions about Okinawan
How long does Okinawan take to grow?
About 120–140 days of warm weather from planting slips to digging — plant only after the soil has warmed up.
How do I grow Okinawan — from seed?
No — from “slips,” which are rooted sprouts. Buy them or sprout your own from a sweet potato, then plant them out when it’s warm.