Jarrahdale Pumpkin Winter Squash stacked on a white background.
Jarrahdale Pumpkin Winter Squash with roasted slices on plate.
A single Jarrahdale Pumpkin Winter Squash languishes on the backside of an old ice bucket.
The California sunrise crests the horizon as a Baker Creek Manager holds a Jarrahdale Pumpkin in the field.
A Baker Creek employee happily holds Jarrahdale Pumpkin Winter Squash grown on the farm.
Freshly harvested Jarrahdale Pumpkin Winter Squash at the Baker Creek Trial farm in California.
Jarrahdale Pumpkin Winter Squash stacked on a white background.
Jarrahdale Pumpkin Winter Squash with roasted slices on plate.
A single Jarrahdale Pumpkin Winter Squash languishes on the backside of an old ice bucket.
The California sunrise crests the horizon as a Baker Creek Manager holds a Jarrahdale Pumpkin in the field.
A Baker Creek employee happily holds Jarrahdale Pumpkin Winter Squash grown on the farm.
Freshly harvested Jarrahdale Pumpkin Winter Squash at the Baker Creek Trial farm in California.

Winter Squash Seeds,
Jarrahdale Pumpkin

4.245 ReviewsSKU: #SQ119Min. seed count: 20
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Regular price $3.50
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Description

(Cucurbita maxima). Slate, blue-gray, 6- to 10-lb pumpkins of superb quality. Its shape is flat, ribbed, and very decorative; also a good keeper. Popular in Australia, an excellent variety. One of the more tasty varieties for many savory dishes and is excellent for a year-round supply of squash, as it will often keep well over 12 months!

Growing Tips: Jarrahdale pumpkins thrive in warm, well-drained soil rich in organic matter. These pumpkins require full sun, so choose a location that receives at least 6-8 hours of sunlight per day. It's important to plant them after the last frost when the soil temperature is consistently above 65 F.

Plant Details

Botanical Name
Cucurbita maxima
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

Start planting Jarrahdale pumpkin seeds outdoors in late spring or early summer, once all danger of frost has passed. In cooler regions, you can start seeds indoors 3-4 weeks before the last frost and transplant them once the soil has warmed up sufficiently. If transplanting, be careful not to disturb the roots when doing so. 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

Directly sow seeds 1/2-1 inch deep in mounds or rows spaced about 3-5 feet apart. If planting in mounds, place 3 seeds per mound and thin them to the strongest seedling. Plants should be spaced 18-36 inches apart.

How to Grow

Water Jarrahdale pumpkins deeply and regularly, aiming for about 1-2 inches of water per week. Mulching around the plants helps retain moisture and suppress weeds. Fertilize with a balanced fertilizer every few weeks, especially as the plants begin to flower and set fruit. Consider using trellises if space is limited, as this can help manage the vines.

How to Save Seeds

  • There are four main 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 it take for Jarrahdale pumpkins to mature?

Jarrahdale pumpkins typically take around 100 days from planting to harvest, depending on growing conditions.

What are common pests and diseases, and how can I prevent them?

Common pests include squash bugs, cucumber beetles, and aphids. These can be managed by regular monitoring and using organic pest control methods like neem oil. Diseases like powdery mildew and downy mildew can be prevented by ensuring good air circulation, avoiding overhead watering, and rotating crops.

Can Jarrahdale pumpkins be grown in containers?

While possible, Jarrahdale pumpkins prefer being grown in the ground due to their extensive vine growth. If space is limited, use a large container and ensure the plant receives adequate support and care.

Browse our full range of winter squash seeds.

Customer reviews

4.2 / 5 45 Reviews

What gardeners are saying

  • Striking blue-grey skin: Slate-blue pumpkins that sell fast at farmers markets.

  • Big, heavy fruit: Some top 20 to 30 pounds, well above the listed size.

  • Dense orange flesh: Thick, meaty flesh for pies, soups and pumpkin bread.

  • Long keeper: Stores on a shelf for months, sometimes over a year.

  • Needs room: Vines sprawl 20 to 30 feet; give them plenty of space.

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