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Waltham Butternut is a full-vine Cucurbita moschata winter squash with creamy-tan skin, orange flesh and good storage potential after curing.
Ready to grow Waltham Butternut at home? Follow our South African Squash Grow Guide for this variety’s sowing depth, warm-weather care and harvest cues.
Quick Grow Facts
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Plant Type: Warm-season edible squash
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Variety: Waltham Butternut
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Scientific Name: Cucurbita moschata
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Outcome: Mature storage squash; cure before cool, dry, airy storage.
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General Sowing Time: Sow after frost once soil is at least 18°C. In cool districts use September–December and sow early enough to finish before autumn frost or prolonged winter rain.
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Position: Full sun
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Growth Form: Full trailing vine; allow at least 2 m of run or use an exceptionally strong trellis and support every developing fruit. No routine pinching is required.
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Pretreatment: No pretreatment needed; sow dry
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Method: Warm direct sow preferred; transplant only a young intact plug before it becomes root-bound
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Sow Depth: About 2 cm in warm, moist, free-draining soil; keep the seed zone evenly moist until emergence.
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Germination: 7–14 days at a 21–30°C seed-zone target; do not direct sow below 18°C
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Final Spacing: Allow about 50 cm between plants, 150 cm between rows and at least 2 m of clear vine run.
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Harvest: Allow roughly 90–110 days in suitable warmth, then harvest only when the tan rind is hard and the stem is dry and corky. Timing varies with conditions.
Why Grow This Variety
- The full-vine plant produces the familiar tan butternut shape.
- Orange flesh suits roasting, soups, stews and baking.
- Mature, undamaged fruit can store after proper curing.
Garden Uses
Harvest fully mature fruit for roasting, soups, stews, curries and baking.
Growing Notes
- Direct sow is preferred. If starting early, use one seed per deep cell and transplant at two true leaves before roots bind.
- Keep the root zone evenly moist through flowering and fruit fill; reduce irrigation as mature fruit hardens.
- Keep fruit on dry mulch or a board and leave a short stem when cutting for curing.
- Do not rely on the stated calendar alone: frost, cold soil and insufficient remaining season are hard stops.
Seed safety: Seed sold for sowing is not food. Do not eat it or use it for feed, sprouts or microgreens; choose seed explicitly supplied for edible sprouting if that is your goal.
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