Courgette plants flowering but no fruit? Act now to save your summer crop

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Courgette flowers are bursting open across UK and US gardens right now, but they’re falling off without producing a single fruit. This August crisis signals pollinator trouble and water stress, and one critical intervention this week could salvage your entire autumn harvest. Read on to find out what gardeners must do immediately.

Why August is make-or-break for courgette production

August is peak courgette season, yet many gardeners are watching flowers drop uselessly from their vines. Across both the UK and US, the combination of intense heat, inconsistent watering, and declining pollinator activity creates the perfect storm for flower abortion. Your plants are flowering prolifically, but without fruit set, you’ll have nothing to harvest by September.

Understanding flower drop and poor fruit set

Courgettes drop flowers for three main reasons: insufficient pollination, water stress, and extreme temperature fluctuations. When soil moisture is erratic, the plant redirects energy away from fruit development and back to survival mode. A single courgette plant can produce dozens of flowers in August, yet only 10 to 20 percent may successfully set fruit under poor conditions.

Male flowers vastly outnumber females on courgette plants, so you’ll see many blooms that can never produce fruit. The real issue arises when female flowers, which appear lower on the stem and have a tiny swelling behind the bloom, arrive but receive no pollen visits. Honeybees and other pollinators are stressed by August heat, working shorter hours and visiting fewer flowers.

What to do in August to save your crop

Act on these four priorities before late August passes:

• Hand-pollinate female flowers using a small paintbrush or cotton bud, transferring pollen from male blooms early each morning when flowers are fully open. This single action can transform your yield within two weeks.
• Water deeply and consistently, providing at least 5 to 7 centimetres of water per week, delivered at the soil level rather than overhead. Inconsistent watering is the primary culprit behind flower drop in August heat.
• Mulch heavily around the base of each plant with straw or compost to regulate soil temperature and retain moisture during the hottest part of the season.
• Remove any yellowing or diseased leaves to reduce plant stress and allow better air circulation, which encourages pollinator visits and reduces fungal pressure.

Looking ahead: maximising your final harvest window

Monitor your plants daily for the next three weeks. Hand-pollinated flowers should begin setting fruit within 48 to 72 hours if conditions are right. By mid-September, you should see a noticeable surge in young courgettes developing along the vine. Keep watering consistently and harvesting small fruits promptly to encourage continued flowering into autumn.