Flowers but No Fruit — How to Hand-Pollinate Squash and Cucumbers

Male vs. female flowers

• Female flowers have a small immature fruit (a mini squash or cucumber) right behind the petals.
• Male flowers sit on a thin, straight stem with nothing behind the petals — and usually appear first, sometimes for a week or two before any females.
• Both open for a single morning; pollen is only viable that day.

How to hand-pollinate

1. 1Go out in the morning — Flowers open early and close by afternoon — pollinate while they're open.
2. 2Pick a male flower — Snap off a freshly-opened male and peel away the petals to expose the pollen-covered anther in the center.
3. 3Transfer the pollen — Brush the anther directly onto the center (stigma) of a female flower, or use a small soft paintbrush or cotton swab to move pollen from male to female.
4. 4Repeat — One male anther can pollinate several females — dab a few while you're at it.

When it's not just pollination

Very high heat and too much nitrogen can make a plant produce mostly male flowers, or drop female buds — so a patch that's all leaves and male flowers may need cooler weather and less nitrogen rather than hand-pollinating. If tiny fruits form and then shrivel, that's usually incomplete pollination, which hand-pollinating fixes directly.

→ Give it a little time first: since males open before females, a young plant with only male flowers usually just needs a few more days for the females to arrive.

Sources

Reviewed 2026-07-18. We cite university Extension, government, and established horticultural sources — and never invent pesticide rates or dangerous treatments.

• West Virginia University Extension — Be a Pollinator — Squash and other cucurbits are monoecious with separate male and female flowers; hand-pollination transfers pollen from the male anther to the female stigma, and female flowers have a small fruit at the base.

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