Buttercup Squash (Cucurbita maxima) – Heritage Seeds

Botanical Name: Cucurbita maxima
Common Name: Buttercup Squash
Heirloom | Open-Pollinated | Non-GMO | Irish-Grown Lineage

Rediscover the rich flavour and cultural legacy of Buttercup squash, a compact winter squash cherished for its dry, sweet, deep orange flesh and classic turban-like cap. This particular seed stock has been lovingly preserved and shared by Irish seed guardian Paul Lyons of Seedsandstuff.ie, helping to continue the legacy of resilient, locally adapted heirlooms in Irish gardens.

Horticultural Points

• Fruit Size: 1.5–2.5 kg each, flattened round with a dark green rind and a distinctive grey-green cap.
• Flavourr: Sweet, dense, and nutty—ideal for roasting, soups, or mash
• Storage: Exceptional keeping quality—stores for 3–5 months when cured properly
• Days to Maturity: ~90–100 days from transplant
• Vining Habit: Vigorous trailing vines; needs space or vertical support

Historical Background

Buttercup squash was first developed in the 1930s by the North Dakota Agricultural College as part of a push to breed productive, flavorful, cold-hardy squash for northern climates. It quickly became a favourite among home gardeners and market growers. This particular line, preserved by Paul Lyons, carries forward not just an heirloom cultivar, but an Irish-grown adaptation—bred in rich Irish soil and stewarded by a committed seed guardian.

Growing Information

• Sunlight: Full sun (6–8 hours daily)
• Soil Needs: Deep, fertile, and well-drained soil enriched with compost
• Watering: Moderate; consistent moisture without waterlogging
• Spacing: 4–6 feet between plants; thrives in wide beds or raised mounds
• Pollination: Insect-pollinated—attracts bees and beneficial insects
• Harvest Tips: Harvest when the stem dries and the rind resists fingernail pressure; cure in a warm, dry place for 10–14 days before storing

Gardening Tips

• Buttercup squash performs beautifully in Irish and cool temperate climates. For best results, start indoors 3–4 weeks before the last frost and transplant after the soil warms. Feed with compost tea or organic fertiliser during flowering for optimal fruit set.

Perfect For

• Hearty winter meals and traditional roasts
• Long-term food storage and self-sufficiency gardens
• Gardeners seeking heritage crops with Irish roots
• Fans of dense-flesh squash varieties like Kabocha or Hubbard

Seed Provenance

• Carefully stewarded and shared by Paul Lyons, Irish seed guardian, from Seeds and Stuff.
• Support Irish biodiversity with every sowing.