How-to Guide
Flowers but No Fruit — How to Hand-Pollinate Squash and Cucumbers
The short answer
If your squash, zucchini, or cucumber is covered in flowers but not setting fruit, it's almost always a pollination gap — not a disease. These plants have separate male and female flowers, and the males open first; early in the season (or when bees are scarce) the pollen just isn't reaching the females.
You can do it yourself in two minutes: in the morning, pick a freshly-open male flower (thin straight stem), peel back its petals, and dab its pollen-covered center onto the center of a female flower (the one with a tiny fruit behind it). One male can pollinate several females.
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
- 1Go out in the morning — Flowers open early and close by afternoon — pollinate while they're open.
- 2Pick a male flower — Snap off a freshly-opened male and peel away the petals to expose the pollen-covered anther in the center.
- 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.
- 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.