Two whole butternut-waltham winter squash stacked next to each other on a white background
Man holding a cut open Butternut-Waltham Winter Squash in a squash field.
Butternut-Waltham Winter Squash on a display table at an Heirloom Exposition at Sonoma Fairgrounds.
A pile of Butternut-Waltham Winter Squash in the field at the Baker Creek trial farm in California.
A close-up view of sliced Butternut-Waltham Winter Squash with sweet juices from the squash.
Two whole butternut-waltham winter squash stacked next to each other on a white background
Man holding a cut open Butternut-Waltham Winter Squash in a squash field.
Butternut-Waltham Winter Squash on a display table at an Heirloom Exposition at Sonoma Fairgrounds.
A pile of Butternut-Waltham Winter Squash in the field at the Baker Creek trial farm in California.
A close-up view of sliced Butternut-Waltham Winter Squash with sweet juices from the squash.

Winter Squash Seeds,
Butternut-Waltham

4.334 ReviewsSKU: #SQ112Min. seed count: 20
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Description

(Cucurbita moschata). An old favorite. Good yields with deliciously rich, orange flesh. Great baked! Introduced by Bob Young of Waltham, Massachusetts, in 1970.

Growing Tips: Waltham Butternut grows best in full sun with well-drained, fertile soil rich in organic matter. Regular watering and mulching are crucial to maintain soil moisture and reduce weed growth. Harvest when rinds become very hard.

Plant Details

Botanical Name
Cucurbita moschata
Life Cycle
Annual
Growth Habit
Vining
Sun Requirement
6–8 hr.
Days to Germinate
5–10
Days to Maturity
100
Planting Depth
½–1 in.
Plant Spacing
18–36 in.
Ideal Temperature
70–95°F
Frost Hardy
No

When to Grow

Waltham Butternut Squash should be planted after the last frost date when soil temperatures consistently reach at least 65 F. In most regions, this means late spring to early summer. In shorter growing seasons, start seeds indoors 2-4 weeks before the last frost and transplant them once the soil is warm enough. If you’re not sure how to find your first and last frost dates, consult our blog post 'Our Experts Answer Questions, Share Resources.'

How to Sow and Plant

For direct sowing, plant seeds 1/2-1 inch deep, spaced 18-36 inches apart in rows 4-6 feet apart. If planting in hills, sow 2-3 seeds per hill and thin to the strongest plant. Ensure that the plants have plenty of room to spread, as the vines can reach up to 15 feet long.

How to Grow

Maintain consistent moisture, particularly during flowering and fruiting stages. Water at the base of the plant to avoid wetting the foliage, which can lead to fungal issues. Fertilize regularly with a balanced fertilizer, switching to one higher in phosphorus and potassium as the plants start to fruit. Mulching helps retain soil moisture and keeps the fruits clean​.

How to Save Seeds

  • There are four different species of squash: Cucurbita maxima, C. pepo, C. moschata, and C. mixta. They will not cross pollinate with each other, so it is possible to grow one of each species for seed saving without worrying about cross pollination.
  • If you are planning to grow several varieties of more than one species, you can bag the blossoms and hand pollinate to avoid crossing.
  • Whether it is a summer or winter squash, you must let the fruit completely mature before extracting the seeds, and cure for at least two weeks.
  • Scoop the seeds, place them in a bucket, and add just enough water to cover. Let sit at room temperature to ferment for two days before rinsing off the pulp.
  • Lay seeds out to dry on newspaper or paper plates.
  • Stored in a cool, dry place, seeds will remain viable for up to four years.

FAQ

How long does Waltham Butternut squash last in storage?

Waltham Butternut squash stores exceptionally well. If cured properly and stored in a cool, dry place, it can last for 2-6 months. The thick skin and hard rind of this variety make it ideal for long-term storage.

Can Waltham Butternut Squash be grown vertically?

Yes, it can be grown vertically on a trellis or cage, which helps save space and improves air circulation. However, the fruits are heavy, so ensure they are supported to prevent the vines from breaking.

What is the best way to fertilize Waltham Butternut squash?

Squash in general is a heavy feeder and benefits from regular fertilization. Start with a balanced fertilizer early in the season and switch to one higher in potassium and phosphorus as the plants start to fruit. Avoid excessive nitrogen as it can lead to more foliage and less fruit production.

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