Courgettes are one of the most productive vegetables you can grow on an allotment. Get them right and a single plant can produce courgettes for weeks on end.
They’re fast-growing, generous, and ideal for beginners — but only if they’re given enough space, water and food. Most problems come from underestimating just how large and hungry courgette plants become.
This guide explains how to grow courgettes successfully in the UK, using methods that work on real allotments, not idealised gardens.
Are Courgettes Easy to Grow?
Yes — with one caveat.
Courgettes are easy to grow because:
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they germinate reliably
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they grow quickly
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they crop heavily
However, they are not low-maintenance. Courgettes need:
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space
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regular watering
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nutrient-rich soil
If you can provide those three things, they’re one of the most rewarding crops you can grow.
When to Sow Courgettes in the UK
Courgettes are tender plants and dislike cold conditions.
You can sow them:
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indoors from April
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outdoors from late May or early June, once frost risk has passed
Starting seeds indoors gives plants a head start and usually leads to earlier harvests.
Never plant courgettes outside until nights have warmed — cold soil will stunt growth.
Where to Grow Courgettes
Courgettes need:
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full sun
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shelter from strong winds
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plenty of space
On an allotment, they work best:
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at the edges of beds
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in dedicated courgette patches
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where their large leaves won’t shade other crops
One plant needs around 90cm of space in all directions. Crowding leads to poor airflow and disease.
Preparing the Soil
Courgettes are hungry plants.
Before planting:
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dig in plenty of well-rotted compost or manure
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aim for deep, moisture-retentive soil
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remove perennial weeds thoroughly
Poor soil equals poor harvests. This is one crop where soil preparation really pays off.
How to Sow Courgette Seeds
Courgette seeds are large and easy to handle.
For indoor sowing:
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sow one seed per pot
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plant seed on its side, about 2–3cm deep
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keep warm and moist
Seeds usually germinate within a week.
Harden plants off gradually before planting outside.
Planting Courgettes Outdoors
When planting out:
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wait until all risk of frost has passed
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plant deeply, up to the first leaves
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water well after planting
Planting deeply helps stabilise the plant and encourages strong root growth.
Mulch around plants once the soil has warmed.
Watering Courgette Plants
Watering is critical.
Courgettes need:
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regular, deep watering
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consistent moisture during flowering and fruiting
Water at the base of the plant, not over the leaves. In dry weather, watering every few days may be necessary.
Inconsistent watering causes:
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poor fruit development
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bitter courgettes
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flowers dropping
Feeding Courgettes
Courgettes respond very well to feeding.
Once flowering begins:
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feed weekly with a high-potassium feed
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compost-rich soil plus liquid feed gives best results
Well-fed plants produce more courgettes for longer.
Pollination and Flowers
Courgette plants produce:
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male flowers (on long stems)
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female flowers (with a small courgette behind them)
If fruits start to rot or fail to develop, poor pollination may be the cause.
Hand-pollinating with a small brush or transferring pollen manually can help during cool or wet weather.
Harvesting Courgettes
Harvest courgettes:
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when they are small to medium size
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regularly — every few days
Frequent harvesting encourages the plant to keep producing. Letting courgettes grow too large slows down future crops.
Cut fruit cleanly with a knife or secateurs.
Common Courgette Problems
Courgettes are generally reliable, but a few issues are common.
Flowers Falling Off
Normal early in the season. If it continues, check watering and feeding.
Powdery Mildew
Appears as a white coating on leaves later in summer. Improve airflow and keep plants well watered.
Rotting Fruits
Usually caused by poor pollination or inconsistent watering.
How Long Do Courgette Plants Crop For?
Courgettes usually crop from:
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mid-summer
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until early autumn
As long as plants are healthy and regularly harvested, they’ll continue producing.
Once growth slows, plants can be removed and composted.
Why Courgettes Are Ideal for Allotments
Courgettes are perfect for allotments because:
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one plant gives large yields
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they make good use of compost-rich soil
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they reward regular visits
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they’re hard to completely fail
They’re an excellent confidence-building crop for new growers.
Planning Courgettes on Your Allotment
Because courgettes take up space, planning matters.
Think about:
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how many plants you really need
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where they’ll shade nearby crops
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how often you can water and harvest
Using an allotment planner helps you:
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avoid overcrowding
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allocate enough space
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plan rotations properly
Final Thoughts
Courgettes aren’t subtle — they either thrive or struggle.
Give them warmth, space, water and food, and they’ll reward you with weeks of harvests. Neglect those basics and they quickly let you know.
For most allotment growers, courgettes earn their space many times over.