Squash - Black Futsu

Minimum Seed Count: 15

Black Futsu is hard to beat. This ancient Japanese heirloom produces deeply ribbed fruits that begin dark green to nearly black and mature into a beautiful chestnut-brown color with a naturally frosted appearance. As the squash cures in storage, its flavor becomes even richer, developing sweet notes reminiscent of roasted chestnuts and hazelnuts. With exceptional taste, long storage life, and stunning appearance, Black Futsu has become a favorite among gardeners, chefs, and heirloom enthusiasts alike.

Plant Details

• Species: Cucurbita moschata
• Plant Type: Winter squash
• Days to Maturity: 95–110 days
• Fruit Weight: 2–5 pounds
• Fruit Color: Dark green maturing to chestnut-brown
• Growth Habit: Vigorous vining plants

Growing Guide

Starting Seeds

• Direct sow outdoors after all danger of frost has passed and soil temperatures reach at least 70°F.
• In cooler climates, start indoors 2–3 weeks before transplanting.
• Plant seeds 1 inch deep.

Planting

• Choose a location with full sun.
• Space plants 3–5 feet apart.
• Allow ample room for vines to spread.
• Grow in fertile, well-drained soil rich in organic matter.

Growing Conditions

• Full sun (8+ hours daily)
• Rich, fertile soil
• Consistent watering during flowering and fruit development
• Mulch to conserve moisture and suppress weeds

Care

• Fertilize throughout the growing season for strong vine growth and fruit production.
• Encourage pollinator activity for optimal fruit set.
• Avoid overhead watering when possible to reduce disease pressure.

Harvesting

• Harvest when fruits have developed a hard rind and deep mature color.
• Cut fruits from the vine, leaving several inches of stem attached.
• Cure in a warm, dry location for 10–14 days.
• Flavor improves significantly after several weeks of storage.

History

Black Futsu is a centuries-old heirloom from Japan and is considered one of the country's traditional squash varieties. For generations, it has been valued for its rich flavor, excellent storage qualities, and adaptability in the kitchen. Its unique appearance and exceptional taste have helped it gain popularity around the world among gardeners seeking rare and historic varieties.

Thank you to our friend Erika @JunesBlooms for sharing these beautiful photos with us!