VegetableSquash
Zucchini Grey Squash
Zucchini Grey Squash is an Old World heirloom with roots stretching back to early 19th-century Italy, prized for its distinctly striped grey-green skin that sets it apart from common solid-green varieties. This open-pollinated Cucurbita pepo produces tender summer squash ready to harvest in just 40-49 days, thriving in zones 3-13 with full sun. The compact mounding plants reach 24-30 inches tall and yield abundantly across most of North America, making this Mediterranean favorite as reliable as it is historically significant.
Photo © True Leaf Market
Growing Conditions
USDA Zone
3-13
Sunlight
Full Sun
Water
Moderate
Soil
Well-drained, Fertile Loam With Organic Matter
Growth Stats
30 in
Height
TypeSpreading
Spacing
36
Plant Profile
Sunlight
Full Sun
Water
Moderate
Zones
3-13
Size
30in H x ?in W
Growth
—
Care
High
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Highlights
The striped skin pattern is instantly recognizable, resembling the popular Greyzinni hybrid yet with the authentic genetics of a true heirloom. Since the early 1800s, Zucchini Grey has been the parent stock for countless Italian summer squash hybrids, which speaks to its genetic vigor and consistent performance. Harvesting begins in the mid-40s day range, so you're enjoying homegrown squash remarkably quickly from seed.
Common Uses
Summer squash like this is harvested young and tender for slicing, grilling, sautéing, or roasting. The striped grey skin is visually striking on the plate, making it particularly suited to fresh market sales or farmers market display. It can be shredded into baked goods, layered into gratins, or simply halved lengthwise and cooked whole as a rustic Italian preparation.
Growing Timeline
No timeline data available yet for this variety.
Care Instructions
Direct Sow
Direct sow seeds into warm soil after all danger of frost has passed and soil temperature reaches 70°F or higher. Plant 1 inch deep, spacing seeds 6 inches apart and thin to final spacing of 36 inches between plants once seedlings emerge.
Harvesting
Begin harvesting 40-49 days after planting when fruits reach 6-8 inches in length. Pick squash while the skin is still tender and glossy; as they enlarge beyond 10 inches, the flesh becomes seedy and the skin toughens. Harvest frequently, every 2-3 days during peak production, to encourage the plant to keep flowering and setting new fruit. Use a sharp knife to cut the fruit from the vine rather than twisting, which can damage the plant.
Growing Calendar
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Companion Planting
Ecology & Traits
Edible
Scientific Classification
Cucurbita pepo
Family
Cucurbitaceae
Genus
Cucurbita
Growth Habit
Spreading
Native Status
L48 (NI)PR (I)CAN (W)
History & Origin
“This variety traces its lineage to Mediterranean gardens of Italy, where it has thrived since the early 1800s. Its unique striped appearance and reliable productivity made it a natural foundation for plant breeders, who have since developed numerous seasonal hybrids and cultivars from Zucchini Grey genetics. Being open-pollinated and non-GMO, it represents a direct connection to Italian horticultural heritage and remains a living link between home gardeners today and the seed savers who preserved it through generations.”