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Growing Courgettes in July: Harvesting and Avoiding Marrows

? Introduction: Make the Most of Your Courgettes This Summer

Courgettes are one of the most rewarding summer vegetables to grow — fast, generous, and perfect for everything from stir-fries to cakes. But come July, those sweet little courgettes can quickly turn into oversized marrows if left unchecked.

Whether you sowed earlier in the season or planted out ready-grown seedlings in June, July is peak courgette month. This guide will help you get the best from your plants: when and how to harvest, how to avoid giant, watery marrows, and how to keep your courgette plants producing right into autumn.

If you want tender, tasty courgettes every few days, keep reading.

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? Why July Is the Most Important Month for Courgettes

• Plants are in full growth thanks to long, warm days
• Bees and pollinators are active, boosting fruit set
• Courgettes can go from perfect to oversized in 2–3 days
• Regular harvesting = more fruit
• Missed fruits = slower growth and tough marrows

In short, what you do in July determines the quality and quantity of your harvest.

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? When and How to Harvest Courgettes

✅ When to Harvest

• Pick when courgettes are 10–15cm (4–6 inches) long
• Aim for young, firm, glossy fruits
• Harvest every 2–3 days to avoid gluts and marrows

Bonus: The more you harvest, the more your plant will produce.

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✂️ How to Harvest Properly

• Use a clean, sharp knife or secateurs
• Cut the fruit cleanly from the stem — don’t twist or tear
• Support the fruit with one hand to avoid damaging the plant
• Remove any yellowing or small undeveloped fruits to refocus energy

Tip: Even small courgettes are delicious and tender — don’t wait!

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? How to Avoid Marrows

A marrow is just an overgrown courgette — large, watery, and less flavourful.

Why Marrows Happen:

• You forget to check your plants for a few days
• You only harvest once a week
• Hot weather and rain spur rapid growth

How to Prevent Them:

• Check plants daily – courgettes can double in size overnight
• Harvest small and often
• Grow a manageable number of plants – 2–3 courgette plants are enough for most households
• Give away or preserve extra courgettes to stay on top of picking

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? What to Do with Oversized Courgettes

Sometimes marrows happen — don’t panic!

Use Them For:

• Stuffing with rice, mince, or cheese
• Soups and stews (remove spongy seeds)
• Grating into courgette cakes or fritters
• Freezing after blanching and chopping
• Composting if past their best

Tip: If your plant has several marrows on it, harvest all of them — they slow down further fruiting.

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? Watering Courgettes in July

Courgettes are thirsty plants — and July heat can dry them out fast.

Watering Tips:

• Water deeply at the base every 1–2 days
• Don’t water the leaves — this encourages mildew
• Mulch around the base to retain moisture
• Increase watering if fruits are forming rapidly

Signs of under-watering: Small, bitter fruits or fruits that stop growing mid-size.

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? Feeding Courgettes for Maximum Yield

By July, your plants are in high production mode — give them the nutrients they need.

Best Fertiliser:

• High-potassium liquid feed (e.g. tomato feed)
• Feed once per week from flowering onwards
• Organic options: comfrey tea, seaweed extract, worm juice

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? Courgette Flowers: What to Keep and What to Pick

Courgettes produce both male and female flowers. Only females form fruit.

Recognising Flower Types:

• Male flowers: Long, thin stem; no swelling behind the flower
• Female flowers: Bulge at the base (the baby courgette)

Should You Pick the Flowers?

• Yes — especially male flowers if your plant has many
• Use in battered, stuffed recipes, or as a garnish
• Leave a few male flowers for pollination

Tip: If female flowers are not forming fruit, poor pollination may be the issue — hand-pollinate using a soft brush.

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? Supporting Courgette Plants

Courgettes are usually bush-type plants but can sprawl across the bed.

Managing Growth:

• Mulch around base to protect fruits from soil rot
• Use tiles, slates, or upturned pots to lift courgettes off the soil
• Consider vertical growing methods for space-saving (e.g. in containers)

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? Common Courgette Problems in July (And How to Fix Them)

❌ Powdery Mildew

• White, dusty patches on leaves
• Caused by dry roots + humid air

Fix: Water at the base, improve air circulation, remove affected leaves

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❌ Poor Pollination

• Courgettes don’t develop or drop off early

Fix: Hand-pollinate using a brush or by swapping pollen from male to female flowers

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❌ Yellowing Fruits

• Fruits begin to form but turn yellow and rot

Cause: Lack of water or poor pollination

Fix: Water consistently and encourage bees

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❌ Rotting or Soft Ends

• Fruits rot on one end while still growing

Fix: Lift fruit off damp soil, mulch underneath, avoid splashing water

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? Companion Plants for Courgettes

Companion planting helps improve pollination, deter pests, and support plant health.

Best companions:

• Borage – attracts bees and improves flavour
• Nasturtiums – deter aphids
• Marigolds – repel whitefly
• Basil – deters beetles and improves overall vigour

Tip: Don’t plant too close — courgettes need airflow.

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? What to Do With Your Courgette Glut

Even with regular harvesting, courgette plants can be prolific.

Use Your Harvest:

• Grated into fritters or muffins
• Sliced for BBQs or stir-fries
• Spiralised into courgetti (courgette noodles)
• Pickled in jars for winter
• Blended into soups or sauces

Preserving tip: Grate and freeze in small batches for winter use in bakes.

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? Top 10 Questions About Growing Courgettes in July

1. How often should I harvest courgettes?
Every 2–3 days. The more you pick, the more they produce.

2. What size is best to pick courgettes?
10–15cm (4–6 inches) for the best flavour and texture.

3. What happens if I leave courgettes too long?
They turn into marrows — large, watery, and less tasty.

4. Can I eat the flowers?
Yes! Especially male flowers. They’re delicious stuffed and fried.

5. Why are my courgettes rotting on the ends?
Poor pollination or excess moisture on the soil. Lift fruit and hand-pollinate.

6. How many courgette plants do I need?
Two or three plants usually provide enough for a family.

7. Do courgette plants need support?
Not usually, but lifting fruit off the ground helps prevent rot.

8. Why are my courgettes bitter?
Often caused by stress — irregular watering or extreme heat.

9. Can I still sow courgettes in July?
Yes, but early July is best. Use fast-maturing varieties for a late crop.

10. How long do courgette plants produce for?
With good care, they’ll crop from July through to the first autumn frost.

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? Conclusion: Keep Picking, Keep Growing

July is peak season for courgettes — but it’s also when things can go wrong if you don’t keep up. With the right care, your plants will reward you with crisp, tender courgettes every few days. But if you turn your back for too long, they’ll give you marrows the size of your forearm.

Stay on top of watering, feeding, and harvesting, and you’ll keep the plants productive and healthy into the late summer and beyond.

So grab your trug, sharpen your secateurs, and make a habit of checking your courgette patch — it’s one of the most productive spots in the garden right now.

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