
If you’ve ever gone out to admire your courgette/zucchini plants, spotted a perfectly sized fruit, and thought, ‘I’ll pick that tomorrow’. You excitedly wander into the garden the next day, only to discover what appears to be a small submarine lurking under the leaves. You’re not alone. Trust me, I’ve been growing Courgettes/Zucchini for years, and this still happens to me more times than I would like to admit.
One of the biggest surprises for new gardeners is just how quickly courgettes grow. They seem to spend weeks doing very little and then suddenly decide it’s time to produce more food than any sensible household could possibly eat. The good news is that this means you’re doing something right. The slightly less good news is that if you don’t keep an eye on them, those lovely little courgettes/zucchinis can quickly become full-sized monster marrows.
Below, we’ll explore how you can avoid this pesky perennial problem with actionable steps.
From here on in, I’m going to use the term courgette – apologies to folk who use the term zucchini, but here in the UK we call them courgettes, so it’s just a more natural term for me to use.
When Should You Harvest a Courgette?
Most courgettes are best harvested when they are around 6–8 inches long (15–20 cm). At this size, the flesh is tender, the skin is soft, and the flavour is arguably at its best. Smaller courgettes are often sweeter and more delicate than larger ones.
The mistake many new gardeners make is waiting for them to get bigger because bigger feels like better value. In reality, once a courgette is beyond about 10 inches long (25 cm), the seeds begin to develop, the skin thickens, and the texture becomes less appealing.
That’s not to say larger courgettes are unusable. They can still be grated into cakes, soups, chutneys, and pasta sauces. But if you’re after the classic tender courgette, about 6-8 inches is the perfect size.
The Secret to More Courgettes
Here’s a useful trick that newer gardeners should be aware of: picking courgettes regularly actually encourages the plant to produce more fruit.
The plant’s goal is to mature its fruit and produce seed. If you keep harvesting, the plant thinks it hasn’t finished its job yet and continues producing fresh flowers and new courgettes. Leave several fruits to mature into marrows, and the plant may slow down production considerably.
Think of harvesting as sending the plant a message: ‘More please!’
A Few Harvesting Tips
- Check plants every day during warm weather.
- Harvest when fruits are 6–8 inches (15–20 cm) long.
- Use a sharp knife or secateurs rather than pulling fruits off by hand.
- Cut the stem cleanly about 1 inch (2.5 cm) below the fruit.
- Lift leaves gently when checking plants – courgettes are experts at hiding enormous fruits underneath.
Many gardeners joke that courgettes don’t grow overnight. They grow when you’re not looking 🫣
Watering Matters More Than You Might Think
Courgettes are thirsty plants. Their large leaves lose a lot of moisture, particularly during warm summer weather.
Aim to water deeply once or twice a week rather than giving little daily sprinkles. During hot spells with temperatures above 25°C (77°F), you may need to water more frequently, especially if plants are growing in containers.
Try to water around the base of the plant rather than over the leaves. This helps reduce the risk of fungal diseases and ensures water reaches the roots where it’s needed most.
For more on the concept of ‘deep watering you can read more here Unlock Healthy Growth with Deep Watering Techniques
A layer of compost or mulch (such as dried leaves, fine wood chips, etc.) around the plant can also help retain moisture and reduce watering needs.
What If The Leaves Start Looking Papery?
One thing that often worries new gardeners is when older leaves begin to look dry, rough, or papery.
In most cases, this is completely normal. Courgette plants produce huge leaves, and as the season progresses, some of the oldest ones naturally age and die back.
However, papery leaves can sometimes indicate:
- A lack of water during hot weather
- Wind scorch
- Natural ageing of older foliage
- Powdery mildew later in the season
If only a few older leaves are affected and the rest of the plant looks healthy, there’s usually no cause for concern. Just remove badly damaged leaves to improve airflow around the plant. In fact, it’s often a good idea to remove some of the lower leaves to help with airflow. Having said that, I wouldn’t lose any sleep over the thinning of leaves. If the plant looks healthy, it should be fine.
If you notice a white powdery coating developing on leaves, this is often powdery mildew. Improving airflow, watering consistently, and removing the worst-affected leaves can help slow its spread.
Common Problems and Simple Fixes
Lots of Flowers But No Courgettes
Don’t panic. Male flowers appear first and don’t produce fruit. Female flowers arrive shortly afterwards and can be identified by the tiny swelling behind the flower
Fruits Rotting While Still Small
This is often caused by poor pollination. Encourage pollinators into the garden by growing flowers nearby, or try hand-pollinating. You can hand-pollinate by using a small paintbrush.
If you want more information on hand-pollinating courgettes, here are links to a couple of good, easy-to-follow YouTube vids. These will give you more confidence and show you exactly what steps to take to hand-pollinate. Why Aren’t My Squashes Fruiting? Boost pollination of squash, zucchini/courgettes & pumpkins (had pollinating comes in at 5 mins in this vid – but it’s well worth watching the whole thing). This short is also very helpful How to pollinate courgettes!
Wilted Leaves During the Day
Courgettes often wilt temporarily in hot sunshine, even when the soil is moist. Check again in the evening before assuming they need water.
Slugs Attacking Young Plants
Mature courgettes usually cope well, but younger plants can be vulnerable. Barriers, regular checks, and encouraging natural predators can all help.
If you’re planting direct, use a closh or netting until the plant is big enough to cope with little beasty slugs.
If you start seeds in a pot or module tray, pot on into a larger pot until the plant is about 5 – 6 inches tall before transferring to its final growing space. You want a nice, strong, healthy plant before planting out.
Help! I Have Too Many Courgettes
This is a surprisingly common problem and one I have almost every year.
If your plant is producing more than you can eat, consider:
- Freezing grated courgette
- Making soup
- Baking courgette cake
- Adding it to pasta sauces
- Making chutney
- Giving some away to friends, neighbours, or unsuspecting relatives
You’ll quickly discover that growing courgettes often turns into a community project.
Although you will be a wee bit late to plant start courgette seeds
Embrace the Occasional Marrow
Despite all the jokes, there’s nothing wrong with growing a marrow 😊 In fact, many gardeners deliberately leave one or two fruits on the plant each year to mature into marvellous marrows. These are excellent stuffed, baked, or turned into chutney.
The important thing is understanding the difference. If you want tender courgettes, harvest little and often. If you want marrows, let them keep growing.
Either way, few vegetables are as productive, rewarding, or enthusiastic as the humble courgette. Just don’t be surprised if tomorrow’s harvest is twice the size of today’s.
Final Thoughts
If your courgettes occasionally get away from you, don’t worry – you’ve joined a very large club of gardeners who’ve discovered a giant fruit lurking under the leaves a week too late. Every oversized courgette is proof that your plant is healthy and productive – so chalk that up as a win.
Harvest little and often if you can, embrace the occasional marrow if you can’t, and remember: there are far worse gardening problems to have than an abundance of homegrown food. Happy harvesting – and don’t forget to check under those leaves!
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- Master Your Garden: The Art of Observation
- Preventing Overgrown Courgettes: Essential Tips
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- Unlock Healthy Growth with Deep Watering Techniques
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- How to Grow Courgettes: A Simple Step-by-Step
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