Whole and sliced Zapallito Del Tronco summer squash with foliage surround on a white background
Sliced and whole Zapallito Del Tronco Summer Squash arranged with blooms on blue background.
Two stacked Zapallito Del Tronco Summer Squash with cut squash on a light blue background.
An overhead view of three Zapallito Del Tronco Summer Squash on jade green background.
Whole and sliced Zapallito Del Tronco summer squash with foliage surround on a white background
Sliced and whole Zapallito Del Tronco Summer Squash arranged with blooms on blue background.
Two stacked Zapallito Del Tronco Summer Squash with cut squash on a light blue background.
An overhead view of three Zapallito Del Tronco Summer Squash on jade green background.

Summer Squash Seeds,
Zapallito del Tronco

4.831 ReviewsSKU: #SSQ131Min. seed count: 20
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Description

(Cucurbita maxima). This Argentinian heirloom squash has a creamy, buttery soft flesh and an edible rind. It is also called avocado squash, due to its low moisture content and creamy consistency. A semi-bush habit and very productive with relative squash bug resistance and excellent heat tolerance.

Growing Tips: Zapallito del Tronco is a traditional heirloom from Argentina known for its round, deep green fruits and rich, nutty flavor. Unlike typical summer squash, it grows on vigorous semi-bush plants and benefits from ample space. Provide fertile, well-drained soil, consistent moisture, and full sun for best results. Harvest young for summer squash or let mature for winter squash.

Plant Details

Botanical Name
Cucurbita maxima
Life Cycle
Annual
Growth Habit
Bush
Sun Requirement
Full sun
Days to Germinate
5–10
Days to Maturity
50–60 (summer); 90–100 (winter)
Planting Depth
1 in.
Plant Spacing
24–36 in.
Ideal Temperature
70–95°F
Frost Hardy
No

When to Grow

Direct sow Zapallito del Tronco seeds outdoors after the final frost when soil temperatures are 70°F or warmer. In cooler climates, start seeds indoors 3–4 weeks early and transplant when conditions are suitable. 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

Sow seeds 1 inch deep in rich, well-draining soil in a location with full sun. Space plants 36 to 48 inches apart, or plant in mounds spaced 4–6 feet apart. Indoors, use biodegradable pots to avoid root disturbance during transplanting. Water thoroughly after planting and keep soil consistently moist during germination and establishment.

How to Grow

Zapallito del Tronco requires regular watering, especially during flowering and fruit set. Mulch to conserve moisture and reduce weeds. Feed with compost or balanced organic fertilizer every few weeks. Train vines or allow them to sprawl, and watch for squash bugs or vine borers. Harvest early for tender summer squash or late for mature fruits that store well.

How to Save Seeds

Note that 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 save seeds from several varieties of the same species, you can bag the blossoms and hand pollinate to avoid crossing.

  • Allow fruit to fully ripen and harden on the vine before harvesting.
  • Cure harvested fruit in a warm, dry place for 2–3 weeks to complete seed development.
  • Cut open fruit and scoop out seeds.
  • Rinse thoroughly to remove pulp, then spread seeds to dry in a well-ventilated area.
  • Dry seeds for 2–3 weeks before storing in an airtight, labeled container in a cool, dry location.

FAQ

Is Zapallito del Tronco squash a summer or winter squash?

Though used like summer squash when young, Zapallito del Tronco is a Cucurbita maxima and can also be left to mature into a flavorful winter squash, perfect for baking or roasting.

Can Zapallito del Tronco grow in containers?

Yes, its semi-bush habit suits a large container, but give it at least 15 to 20 gallons with excellent drainage. Use high-quality potting soil, place it in full sun, and expect to water daily in hot weather.

How do I know when to harvest Zapallito del Tronco squash?

For summer use, harvest when fruits are small, glossy, and about 3–4 inches across. For winter squash, wait until the skin hardens and the stem begins to dry before harvesting.

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