Answer: Winter squash and pumpkins can cross pollinate each other but don't worry about the cucumbers. Unless you're saving seed, you can plant these crops right next to each other. This cross pollination will only effect next year's crop grown from this year's saved seed. If you're saving seed, you'll need 1/2 mile separation between groups or to hand pollinate the fruits. You can start winter squash, pumpkins and cucumber indoors 4 weeks before your last frost date (around April 1st in El Paso), so get planting!
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