Courgette flowers but no fruit: why and how to fix it

Why courgette flowers but sets no fruit

Your courgette plant (Cucurbita pepo) is covered in flowers, yet no fruits are growing. This is a common complaint and has almost always the same cause: the flowers are not being pollinated. Courgette requires pollination to set fruit, and without bees or hand help, it fails.

A courgette plant produces both male and female flowers. Only the female flowers can develop into fruit. The female flower already has a small green fruit at its base. If that flower is not pollinated, the tiny fruit withers and falls off. This feels frustrating because the plant clearly thrives but yields nothing.

Fortunately it is usually easy to solve. We will teach you all techniques to get your courgette to set fruit.

Recognizing male and female flowers

This is the key difference. Your courgette has two types of flowers, and you must be able to tell them apart.

Male flowers have just a thin stem with no swelling. Inside the flower is yellow pollen. These flowers fall off after a few days. They serve only to produce pollen.

Female flowers have a small, green, oval-shaped fruit at the base of the stem. This is the future courgette. The flower sits on top of that fruit. Only these flowers set fruit after pollination.

Tip: count on your plant: far more male flowers than female. This is normal. A healthy plant has a ratio of 3 to 5 male per 1 female flower. That one female must be pollinated.

Why your courgette is not setting fruit now

Five causes, each with a solution.

1. No bees in your garden

This is the most common reason. Courgette blooms from June to September, peaking in July and August, just when many gardens are dry and bees are scarce. In hot, dry weeks, bees retreat to water and shade. Your courgette stands in full sun, where it is hot.

Solution: attract bees (see further). Or hand-pollinate. Or both.

2. Heat above 35 degrees

Courgette loves warmth, but not as much as you might think. Above 35 degrees, pollen is not released properly and is not viable. Male flowers produce less pollen, female flowers like it less. Both are problems.

Solution: provide shade with a light shade cloth (30-40% shade) when it is extremely hot (above 35 degrees). This also helps prevent drying out.

3. Too little water

A courgette in drought does not drop its flowers, but the tiny fruits do not grow and fall off. This feels like "flowers but no fruit" but is really "fruits that don't stay". Watering is the solution.

Solution: water deeply (5-10 litres per plant) every 2-3 days. Better once thorough than a little every day.

4. Too much nitrogen

Courgette responds to excess nitrogen by making leaves and flowers, no fruits. You may have fertilized generously in June. Nitrogen promotes leaves, not pollination or fruiting.

Solution: stop giving nitrogen-rich fertiliser. If the plant still needs feeding, use a potassium and phosphorus rich tomato feed instead.

5. No viable pollen

In rare cases, the pollen itself is sterile. This can happen after extreme cold or extreme heat in the previous season, or with very weak plants. You recognize this by the male flowers having yellow pollen but not releasing it.

Solution: usually temporary. Wait a few weeks and try again.

Hand pollination: the quick fix

This is most reliable. You don't have to wait for bees.

Step 1: Choose a male and female flower

Male flower: has no fruit at the base. Female flower: has the green fruit.

Step 2: Pick the flowers

Gently snap the male flower just below the bloom. Do the same with the female flower, but be careful not to damage the green fruit.

Step 3: Apply pollen

Hold the male flower upside down over the female flower. Gently move the pollen to the stamens in the centre of the female flower. You will see yellow powder transfer. Press gently.

If you have no male flower, you can use a soft brush or cotton swab to move the yellow pollen from a male flower to the female flower.

Step 4: Repeat

This is the only downside: you must do this every morning as long as there are female flowers. Good news: once one fruit starts growing, it will attract more bees. Once your first courgette grows, it will improve by itself.

This process works almost always. Within 3 to 5 days you will see the tiny fruit grow.

Attracting bees

Actually the best way: work with nature, not against it.

Courgette is very attractive to bees. But if there are no bees in your area, they cannot come. So: provide bees.

Sunflowers (Helianthus annuus) and phacelia (Phacelia tanacetifolia) next to courgette: these flowers bloom at the same time and are easy for bees. They draw bees your way.

No insecticide or pesticides: even organic sprays can harm bees. Stop using them while courgette blooms.

Drinking water: a small dish with stones in it (so bees don't drown) helps greatly.

More plants: courgette, pumpkin, melon, cucumber: all have the same flower types. The more you grow, the more bees you attract.

Let the lawn flower: let clover and dandelions bloom in your lawn now and then before mowing, giving bees extra food exactly while your courgette is in flower. If you do mow, do it in the evening when bees are less active, and avoid chemical weed killers on the lawn.

When to pollinate

Male and female flowers both open in the early morning, around 5-6 AM. They close around 12-1 PM. This is your window. Pollinate between dawn and 1 PM, best right after the flower opens.

Bees also work mornings. So: pollinate (or let bees do it) in the morning, not afternoon.

Water and feeding: the foundation

Both hand pollination and attracting bees work only if the plant is healthy.

Water: every 2-3 days 5-10 litres per plant. Daily in heat. Watch: feel for moisture, don't leave it visibly waterlogged.

Mulch: 5 cm of compost around the plant (not touching the stem) helps retain water and provides food. This is your best friend in hot summer.

Feeding: in June one more helping of compost. After early July, stop fertilizing. The plant must focus on fruit.

Shade: in extreme heat (above 35 degrees) a light shade cloth. This helps against both overheating and drying out.

Step by step

Step 1: Attract bees

Plant sunflowers or phacelia next to courgette. Set out a dish of water.

Step 2: Check daily

Look each morning for female flowers just opening. These have the green fruit.

Step 3: Hand pollinate (option A)

If no bees: pluck male flower, place in female flower, gently press until pollen releases.

Step 4: Or let bees do it (option B)

Wait until 10 AM. Bees should have already pollinated by then.

Step 5: Water

Every 2-3 days at least 5 litres per plant. This is most critical.

Step 6: Patience

In 7-10 days you will see the first courgette grow. After that it goes much faster.

Frequently asked questions

Why do all the tiny fruits fall off? Usually water. Once you water deeply and regularly, they will stay.

My courgette now has one fruit. Do I keep pollinating? No. Once one fruit is growing, the plant will release hormones that attract more female flowers. It will speed up naturally.

Can I use pollen from another plant? Only from another Cucurbita, such as pumpkin. Melon or cucumber pollen will not work: they belong to a different genus and are not compatible with courgette.

How long until I harvest the first courgette after pollination? 7-10 days. You will see the fruit grow, grow, grow.

By season: what to expect

June: first male flowers, shortly after planting out in May. No female ones yet. Patience.

Late June to mid-July: first female flowers. Now it succeeds or fails.

July and August: peak time. Many female flowers, big harvest if all went well.

September: slowly waning, but still possible.

October: usually over, unless you are in a very mild region.

Summary: why and what to do

Courgette blooms massively but sets no fruit? It is almost certainly pollination. Three quick things: (1) hand-pollinate every morning, (2) attract bees with companion plants, (3) water every 2-3 days deeply.

With these three actions you will see more fruit in 50% of cases. More water, less heat, and hand pollination together: 95% success rate.

See it in your own garden first

Curious how your courgette fits in your garden alongside other vegetables and flowers? Upload a photo of your vegetable garden to gardenworld.app and see a free preview of a new design with courgette, bee plants and pollinator spots. The detailed image with plant list costs 7.99, one time, no subscription.