'Guatemalan Blue' Winter Squash

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Slate-blue heirloom squash with a mild flavor and long shelf life

“Guatemalan Blue” winter squash ( Cucurbita maxima ), offered by OSC Seeds

An heirloom variety cultivated for over 1,500 years by the indigenous peoples of South America, this squash produces elongated fruits with a hard , smooth, slate-gray shell. Measuring on average 35 to 40 cm , they offer sweet flesh with a nutty flavor, ideal for soups, purées, and roasted dishes. An excellent storage squash, it is also very vigorous: allow plenty of space, as it can be an aggressive grower .

Propagation: Indoor sowing or direct sowing in late spring
Height/Habit: Creeping vines
Packet size: Approximately 5 to 10 seeds
Harvest time: 90 days
Frost tolerance: Killed by frost
Companion plants: Beans, corn, nasturtiums
Incompatible plants: Other closely related cucurbits (competition)

Planting and maintenance:
Sow indoors 2 to 3 weeks before the last frost, or directly when the soil is warm. Plant in full sun in rich, loose, well-drained soil. Allow plenty of space , as the vines are vigorous and spread out. Water deeply but not excessively, avoiding wetting the foliage. Harvest when the husk has hardened and the slate-blue color is well developed. Store in a cool, dry place for long-term storage.

The availability of our seeds varies depending on seasonal availability, production schedules and supplier inventory. Certain varieties may only be offered for a limited time based on their natural growth cycle, sowing period or available stock. These product pages are designed to help and inspire gardeners in choosing the right seeds for vegetable gardens, flower beds, pollinator gardens, container growing, naturalization projects and sustainable outdoor spaces.