Japanese Red

Family: Convolvulaceae Root Vegetable

Sink your spoon into Japanese Red’s rich, sunset-orange flesh—silky-smooth when cooked, with a naturally sweet, honeyed depth that lingers on the palate.

The tubers form with an elegant, tapered shape and a warm copper-red skin that peels cleanly to reveal velvety color, making them a standout for bold color in any harvest basket. Grow Japanese Red for dependable, garden-friendly performance and a vibrant orange tuber that shines in roasting, mashing, and hearty sauces.

Light: Full SunMaturity: 105 DaysHabit: Vine

Planting schedules and alerts are optimized for Columbus (Zone 6b).

Crop Dates

Milestone	Date
Start Indoors	Direct Sow
Last Frost	Apr 25th
Transplant / Sow Outdoors	Apr 25th
Harvest Begins	Aug 8th
Harvest Ends	Oct 16th

Crop Details

Trait	Value
Days to Maturity	105
Sun Requirements	Full Sun
Growth Habit	Vine
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	80
Min Soil Temp (°F)	60
Min Night Temp (°F)	55
Harden Off (days)	Not Required

Culinary Notes

Chef's Note

Japanese Red cooks up with a silkier mouthfeel than many orange sweet potatoes, so it doesn’t go gluey—it becomes spoon-tender with a honey-caramel finish. It’s built for heat-heavy cooking (roast, mash, blend) where its sweetness rounds out against sharp citrus or peppery spice.

Best Uses

roasting in thick wedges to concentrate the honeyed edges
mashing for a spoon-coating puree that stays silky
velvety soups or curry sauces (blend, then gently reduce for cling)
baking into custardy sweet-potato filling for pies or hand pies

Flavor Profile

naturally sweet, honeyed taste silky-smooth, velvety texture when cooked warm, coppery earthiness with lingering caramel notes

Kitchen Pairings

butter cinnamon maple syrup lime ginger black pepper

Frequently Asked Questions

What pest or disease is most likely on Ipomoea batatas (Japanese Red) and how can I control it?

Watch for sweet potato weevil damage and sour rot—both often show up after warm, humid weather. Remove and destroy any plants with soft, wet stems or rotten storage roots, then improve airflow and avoid wetting foliage when irrigating. If you see weevil frass/holes, harvest promptly and cure roots immediately after digging to reduce rot during storage.

How often should I water Japanese Red sweet potatoes during the main growing phase (vining/leaf growth)?

During the main growth phase, keep soil consistently lightly moist but never waterlogged—aim for about 1 inch of water per week, adjusting for heat and soil type. Water deeply so moisture reaches the root zone, then let the top 1–2 inches of soil dry slightly before watering again. In the last 2–3 weeks before harvest, reduce watering to limit splitting and rot of the storage roots.

How do I know when Japanese Red sweet potatoes are ready to harvest at about 105 days?

Begin checking near 105 days when the vines start to yellow and decline, especially if nights have cooled slightly. Dig a few roots carefully with a spading fork; they’re ready when the skin is set and the roots are well-sized for the variety. Harvest on a dry day, and cure the roots for 7–10 days in warm, humid conditions to improve sweetness and healing of any cuts.