Vegetables flowering but no fruit: what to check

First check: identify the crop and look for tiny developing fruit after flowering. A flower opening is only one stage of producing a harvest, and different crops need different conditions.

Start with the crop

Tomato flowers contain both male and female parts. Movement helps release pollen; a closed, still greenhouse can make conditions less favourable. Gentle tapping of a flowering truss can help pollen move, but it cannot make heat-damaged pollen viable.

Courgettes and many squash have separate male and female flowers. A female has a small swelling beneath the flower. Male flowers alone cannot become fruit, and their appearance before female flowers is not necessarily a fault. For crops needing insect pollination, check access when flowers are open.

Cucumber varieties differ: some set fruit without pollination and have specific instructions about male flowers. Follow the seed supplier's guidance rather than treating every cucumber like a courgette.

Look at temperatures

Prolonged heat can interrupt fruit set even on vigorous plants. Tomatoes are particularly vulnerable when days and nights stay hot. Cold can also disrupt pollination. A spell of dropped flowers does not necessarily mean the whole plant has failed; later flowers may set when conditions improve.

Check temperatures where the plants grow, especially under glass. Ventilate early and use appropriate summer shading. Avoid enclosing flowering crops in an overheated space in an attempt to protect them.

Check water and feeding

Drought and large moisture swings add stress. Check the root zone and keep watering consistent with the crop's needs. More fertiliser is not a general cure for flower drop.

Excess nitrogen can encourage leafy growth at the expense of a crop. Review what you have already applied before feeding again. Do not try to counter suspected overfeeding by adding another nutrient blindly.

Choose one useful action

If insects cannot reach a crop that needs them, provide access while flowers are open. If heat is the issue, improve ventilation and shade. If plants are dry, correct watering. Keep a short note of weather, flowering and first fruit so you can judge later flowers rather than yesterday's lost ones.

For persistent failure, use the crop guide to check variety, light and growing requirements. Avoid routine spraying of flowers; identify an actual pest problem before considering a treatment.

Back to Solve a Growing Problem · Find your crop guide

Further reading: University of Minnesota Extension on heat and vegetable yields, Missouri Botanical Garden on tomato pollination, and Mississippi State Extension on tomato problems.

By Simon Adams · Published 27 October 2026. Adapt advice to your crop and conditions.