← The Notebook
Notebook · Guide 8 October 2026 · Grow your own

Courgettes flowering but no fruit: male and female flowers explained

Early courgette flowers are mostly male and can't fruit. Wait for females with a baby fruit behind them, then hand-pollinate if insects are scarce.

grow your own

Your courgette is covered in big yellow flowers and there isn't a courgette in sight. Or tiny fruits keep appearing, going soft at the tip and rotting before they're the size of your finger. Usually nothing is wrong with the plant. Courgettes, pumpkins and squashes carry separate male and female flowers. Only the females make fruit, and only after pollen from a male reaches them. Early in the season the timing often doesn't line up yet. Know which flower is which and you can fix it yourself in a minute.

01At a glance

  • Male flowers: a plain, slender stalk behind the bloom. They can never become fruit.
  • Female flowers: a tiny fruit behind the bloom. This is the courgette you'll eat, if it gets pollinated.
  • Mostly males early on is normal. The RHS says young plants often make mainly male flowers at first, and the balance improves later.
  • Tiny fruit rotting at the tip usually means poor pollination, often in cold, wet weather when insects are scarce.
  • Hand-pollinate with a male flower if bees aren't doing it for you.

02Tell male from female

Look behind the petals, not at them. The two flowers are the same colour and size.

  • Female: a miniature fruit sits between the stem and the flower, close to the main stem. In a courgette it's a tiny green or yellow courgette. In a pumpkin it's a little round ball.
  • Male: the flower sits on a long, thin, plain stalk with no swelling at all.

The first flush of flowers often drops off the plant. That's fine, and the University of Minnesota Extension notes it's normal.

03Why you're getting flowers but no fruit

The RHS lists several causes, and more than one can apply at once:

  • The plant is too young or small to support fruit yet.
  • Poor pollination. Cold, wet weather keeps insects away. Plants under cloches or glass may get few visitors at all.
  • Too few female flowers. Cold, low light, shade and overcrowding all reduce them. So does planting out too early.
  • Too few male flowers. Heat and poor ventilation under cover can cut male flowers.
  • A stressed plant. Weak, stressed plants set poorly. Water and feed regularly, especially in pots.
  • Infrequent picking. A plant carrying big fruit sets fewer new ones.

04How to hand-pollinate

This is the RHS method.

  1. Find an open female flower, the one with the tiny fruit behind it.
  2. Pick an open male flower and pull or peel the petals away so the pollen-covered centre is exposed.
  3. Press the male flower's centre gently into the centre of the female flower.
  4. One male can pollinate several females, so move on to the next.

If it worked, the little fruit behind the flower starts to swell. If it shrivels from the flower end and rots, it wasn't pollinated. Pick it off and try again on the next female.

Under glass, leave doors and vents open on hot days to let insects in.

05Cucumbers are the exception

Cucumbers are where this advice flips, so check your seed packet.

  • Most greenhouse varieties are all-female. The RHS says these must not be pollinated, or the fruit may be bitter. If an occasional male flower appears (no baby fruit behind it), remove it.
  • Outdoor ridge varieties carry both kinds of flower, and the females need pollinating. Don't remove the males.

06Keep it fruiting once it starts

  • Water consistently at the base, not over the leaves. In hot weather pots may need watering every day. The RHS suggests sinking a 15cm pot beside each plant and watering into it.
  • Feed pot-grown plants every 10–14 days with a high-potash liquid feed once the first fruits start to swell. Plants in decent ground often need nothing.
  • Pick courgettes small, at about 10–12.5cm long, and keep picking. Regular picking keeps the plant cropping.
  • For bigger pumpkins, the RHS suggests letting only two or three fruits develop per plant.

If you want to eat the flowers, take males. They carry no fruit, so you don't lose any of the crop.

Save your money
Don't buy a "fruit set" product or extra feed for an early plant that's only making males. Time and warmer weather fix it.
A male flower is the only tool you need to hand-pollinate. No brush required.
Don't save seed from your own courgettes. The RHS links bitter fruit to plants grown from saved seed that may have crossed with other squashes. Bitter fruit can upset your stomach, so don't eat it.

Before growing these where children or pets play, check the safety flags on our courgette, pumpkin and cucumber profiles.

How we checked this

Every care and safety claim on this page is verified against horticultural and veterinary sources.

Sources: RHS — Courgette, marrow, pumpkin and squash problems · RHS — How to grow courgettes · RHS — How to grow cucumbers · RHS — How to grow pumpkins · University of Minnesota Extension — Growing summer squash and zucchini in home gardens · Clemson Cooperative Extension — Summer squash

Checked 8 October 2026. If our advice ever conflicts with the RHS, believe them and tell us.