Courgette (Zucchini) Flowers but No Fruit? Here's the Fix

Courgettes have a reputation as the vegetable that buries you in produce, so a plant covered in big golden flowers but producing nothing to pick feels like a personal insult. In fact it is one of the most common — and most fixable — problems in the summer vegetable garden. It nearly always comes down to which flowers the plant is making, and whether anyone is moving pollen between them.

First, understand the two kinds of flower

Courgettes, like all squash, carry separate male and female flowers on the same plant, and telling them apart takes two seconds once you know the trick. A male flower sits on a long, thin, plain stalk. A female flower has what looks like a miniature courgette — a small swollen ovary — between the stem and the petals. Only female flowers can become fruit, and only if pollen from a male flower reaches them. Each flower opens for just one morning, then closes, so the window for pollination is short.

Reason 1: it's early days and the plant is only making males

Young courgette plants almost always open a run of male flowers first — sometimes for two or three weeks — before the first females appear. This is normal and deliberate: the early males advertise to local bees and get them visiting regularly before the plant invests in fruit. So if you look closely and every flower is on a thin stalk with no baby fruit behind it, nothing is wrong. Keep the plant watered and fed, and the females will come.

Reason 2: the females aren't getting pollinated

The classic symptom: tiny courgettes form, stall at a few centimetres, then turn yellow, go soft at the blossom end and drop off or rot. That is an unpollinated (or under-pollinated) fruit being aborted. Squash pollen is heavy and sticky — it does not travel on the wind — so the plant depends entirely on insects, mainly bees, carrying it from male to female during the few morning hours the flowers are open. Cool cloudy spells, a bee-poor garden or balcony, and even rain at the wrong moment can leave the females unvisited.

The reliable fix is to do the bees' job yourself. Hand-pollination takes under a minute:

• Go out in the morning, ideally before midday, while the flowers are open.
• Pick a freshly opened male flower (long thin stalk, no baby fruit) and peel back its petals to expose the pollen-covered anther in the centre.
• Gently dab the anther onto the stigma — the sticky, multi-lobed structure — in the centre of each open female flower. A soft paintbrush or cotton bud works just as well if you'd rather not pick flowers.
• One male can pollinate several females. Repeat with each new female flower that opens.

Properly pollinated fruit swells noticeably within days. If hand-pollinated females still abort, look at heat and stress next.

Reason 3: summer heat

In heatwave conditions — sustained days above roughly 30–32°C — squash pollen loses viability and flowers can drop before setting anything. Plants also tend to shift towards producing male flowers under heat and drought stress. There is no arguing with the weather, but you can blunt it: water deeply and consistently at the base (uneven watering is a stress signal that costs you female flowers), mulch around the plant to keep the roots cool and moist, and pollinate early in the morning while the pollen is fresh. Fruit set usually resumes as soon as the temperature breaks.

Reason 4: too much food, or the wrong kind

A courgette gorging on nitrogen-rich fertiliser grows magnificent leaves and not much else. If your plant is huge, deep green and lush but flowering sparsely — or making mostly males — ease off the general-purpose feed and switch to a high-potash tomato fertiliser, which encourages flowering and fruiting. The same logic applies to very rich, fresh manure beds.

Tip: once fruit does start coming, pick it small and pick it often — every two or three days. A single courgette left to swell into a marrow tells the plant its seed-making job is done, and production slows right down. Regular harvesting keeps the plant flowering and fruiting until autumn.

A quick word on blossom end rot lookalikes

A fruit that grows to a decent size and then develops a sunken, leathery brown patch at the flower end is a different problem — blossom end rot, caused by a calcium supply hiccup that is nearly always down to erratic watering rather than poor soil. The cure is steady, deep, regular watering and mulch. If your fruits are stalling tiny and yellowing instead, that is pollination, not rot.

If you are unsure what is happening on your plant — flower type, a stalling fruit, a leaf problem like powdery mildew — photograph it in PlantMe. The app identifies the plant and checks symptoms against a library of over 500 diseases and disorders, so you can tell a pollination hiccup from a disease in seconds.