Kogiku Japanese Pumpkin Seeds - Ribbed Green Winter Squash

Grow a distinctive Japanese pumpkin for your kitchen with Kogiku winter squash seeds. The dark-green, deeply ribbed fruits hold sweet, dark-yellow flesh that works beautifully in tempura, stir-fries, and baked dishes. Harvest a few from your own sunny garden patch and turn them into a comforting seasonal meal.

Choose your seed quantity

This listing is for seeds to plant, not live plants or harvested pumpkins. Choose:

• 10 seeds
• 25 seeds
• 100 seeds

Variety details

• Variety: Kogiku
• Crop: Japanese pumpkin / winter squash
• Rind: Dark green with pronounced ribs and a textured surface
• Flesh: Sweet, dark yellow
• Approximate fruit weight: Around 2 lb under suitable conditions
• Growth habit: Spreading vines
• Season: Warm-season annual
• Light: Full sun
• Uses: Tempura, stir-frying, roasting, and baking

Fruit size, appearance, flavor, and yield vary with growing conditions. Winter squash refers to harvesting mature fruit for cooking and storage, not an ability to tolerate winter frost.

When to plant

Direct sow after frost danger has passed and the soil is reliably warm, approximately 70°F or above. Allow a sustained warm season for vine growth, flowering, and fruit ripening.

For an earlier start, sow indoors in individual pots approximately 3–4 weeks before your intended transplant date. Acclimate seedlings gradually to outdoor conditions and transplant while young, handling roots gently.

In frost-free climates, follow your local squash planting calendar and consider heavy rain, extreme heat, and pest pressure rather than assuming year-round performance.

Sowing and spacing

1. Choose a sunny site with fertile, well-drained soil.
2. Incorporate finished compost if needed and prepare enough room for spreading vines.
3. Sow approximately 1 inch deep and water gently.
4. Maintain even moisture without waterlogging the seedbed.
5. Allow approximately 5–10 feet between planting mounds, adjusting for your layout and vine growth.

Thin to strong seedlings without crowding. Snip unwanted seedlings at soil level rather than pulling where nearby roots could be disturbed.

Vines and support

Allow vines to sprawl on the ground or train them gently onto a sturdy trellis installed early. Vertical growing requires secure support for both vines and developing fruit; use suitable slings if necessary. A small patio container is not a good fit for a spreading pumpkin vine.

Growing care

• Water consistently at the root zone, especially during flowering and fruit development.
• Mulch around established plants to conserve moisture, keeping material away from stems.
• Feed according to soil needs and fertilizer label directions.
• Inspect regularly for squash bugs, cucumber beetles, vine injury, and leaf disease.
• Keep fruit away from persistently wet soil using a clean, dry support when practical.

Flowers and pollination

Male flowers often appear before female flowers. Pollinating insects need access to blooms for fruit set, so remove insect-excluding covers when flowering begins if they block pollinators. Hand pollination may help where insect activity is limited, but weather and plant health also influence fruit development.

Harvesting mature squash

The listing's approximate 30-day maturity reference is measured after fruit set, not from sowing. Use it as a general guide rather than a guaranteed harvest date. Allow additional time for seedlings, vine growth, flowering, and successful pollination.

Harvest when the fruit has developed its mature appearance, the rind is hard, and the stem begins to dry. Judge several maturity signs together. Harvest before frost where applicable.

Use clean pruners to cut the individual fruit stem, leaving several inches attached. Carry pumpkins from underneath rather than by the stem, and avoid bruising or cutting the rind.

Curing and storage

Place sound, fully mature squash in a warm, dry, well-ventilated location for approximately 1–2 weeks to cure when conditions allow. Protect from rain, frost, and excessive heat rather than leaving fruit in harsh sun.

Store intact fruit in a cool, dry, ventilated place and inspect regularly. Use damaged but otherwise sound fruit promptly, and discard squash with mold, decay, or soft rot. Storage life varies with maturity, handling, and conditions. Refrigerate cut squash promptly and use soon.

From garden to kitchen

Wash the rind before cutting, remove the seeds, and prepare slices or pieces for tempura, stir-fries, roasting, or baking. Use a stable cutting board and a suitable sharp knife to handle the firm rind safely.

Discard squash with an unusually intense bitter taste. Do not continue eating it or rely on cooking to remove the bitterness.

Seed storage

Store unused seeds sealed in a cool, dry, dark place away from moisture and temperature extremes. Seeds supplied are for planting, not direct consumption.