Varieties of the true pumpkin readily cross with each other, but this cross-pollination will not be apparent unless seed are saved from this year's fruit and planted next year. Pumpkins will not cross with varieties of true squash. All varieties of summer squash are, in reality, true pumpkins and will cross readily with each other and with other pumpkins. If you grow both summer squash and pumpkins in your garden, you should not save seed for planting in next year's garden.
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Will pumpkins cross with squash, watermelons, or cucumbers, resulting in off-type fruit?
Last Updated: January 07, 2008
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