Courgettes have a reputation problem in Ireland. Half the gardeners I talk to swear they are foolproof, and the other half have a sad, yellowing plant that has given them nothing but trouble and three flowers. Both groups are usually doing almost the same thing, and the gap between a glut and a failure is smaller than you would think.
This guide walks through how to grow courgettes in Ireland from seed to harvest, including the two reasons most plants here stop fruiting and exactly what to do about each one.
Why Courgettes Suit Irish Gardens
Courgettes are one of the most forgiving crops you can put in an Irish vegetable patch. They do not need a long hot summer like aubergines or melons, just a decent run of mild weeks and consistent water, both of which Ireland tends to provide.
The trade-off is that courgettes are hungry and thirsty. Skip the feeding or let the soil dry out and growth stalls fast. The plant itself rarely dies from this. It just stops bothering to fruit, which is the most common complaint Irish growers have.
When to Sow Courgettes in Ireland
Timing matters more than most guides let on, because Ireland’s soil warms later than the seed packet instructions usually assume.
Indoors. Sow from mid-April to early May, in small pots, about 2cm deep, one seed per pot, on its edge. Courgette seeds need roughly 20 degrees to germinate reliably, so a windowsill, heated propagator or a bright porch works far better than an unheated greenhouse this early in the year.
Direct outdoors. Only attempt this from late May onwards in the warmer parts of the country, and even then a late frost can wipe out a direct-sown crop overnight. Starting indoors gives you a head start and a safety net.
A courgette plant that is ready in March will sit pot-bound and stressed for two months waiting for outdoor conditions to catch up, and it rarely thanks you for it later.
How to Sow the Seed
- Fill 9cm pots with a good seed compost.
- Push one seed in on its edge, about 2cm deep, to reduce rot risk.
- Water well, then keep the compost just moist, never waterlogged.
- Place somewhere warm and bright. Germination usually takes five to ten days.
- Once true leaves appear, move to a cooler, brighter spot to stop the seedling getting leggy.
Hardening Off and Planting Out
This is the step most Irish gardeners rush, and it is where a lot of plants get checked badly.
Hardening off means gradually introducing an indoor-raised seedling to outdoor conditions over seven to ten days, starting with a few hours outside in a sheltered spot and building up to a full day and night before planting.
| Before Planting Out | Check |
|---|---|
| Frost risk | Fully passed in your area, typically late May to early June |
| Plant size | At least three or four true leaves |
| Daytime temperature | Reliably above 12 degrees |
| Soil | Dug over with plenty of well-rotted manure or compost worked in |
Spacing, Feeding and Watering
Courgette plants get far larger than the seedling suggests, and overcrowding is one of the quickest routes to disease.
Spacing. Leave at least 60 to 90cm between plants in every direction. A bush variety still needs the room to breathe and to let air move through the leaves.
Watering. Water at the base of the plant, never over the leaves, and aim for deep, regular watering rather than a light daily sprinkle. A mulch of straw or compost around the base helps retain moisture through dry spells.
Feeding. Once flowers appear, switch to a high-potash feed, the same kind used for tomatoes, every one to two weeks. This pushes the plant towards fruit production rather than just leaf growth.
Sown indoors mid-April to early May. Hardened off over 7 to 10 days. Planted out only after frost risk has passed. At least 60cm between plants. Mulched to retain moisture. Feeding with a high-potash fertiliser from first flower.
Solving the Pollination Problem
This is the single biggest reason Irish courgette plants flower beautifully and produce nothing.
Courgettes produce separate male and female flowers on the same plant. Male flowers appear first, sometimes two to three weeks before any female flowers show up, and a lot of gardeners give up around this point assuming something is wrong. Nothing is wrong. The plant is just getting started.
You can tell them apart easily. Female flowers have a small swollen fruit shape at the base, behind the petals. Male flowers sit on a plain thin stem.
If you have female flowers opening but no fruit is forming, low bee activity is almost always the cause. The fix:
- Pick an open male flower in the morning.
- Strip back the petals to expose the pollen-covered centre.
- Gently dab it into the centre of an open female flower.
- Repeat for each female flower you want to set fruit.
Do this every morning while flowers are open and you will see a noticeable jump in how many fruits actually form, regardless of what the bees are doing that week.
Harvesting for a Longer Season
The biggest mistake with harvesting is letting fruit grow too large before picking. A courgette left to balloon to marrow size tells the plant its job is done, and it slows or stops producing new fruit.
Pick fruits at 12 to 18cm long, usually every two to three days once the plant gets going. Use a sharp knife rather than twisting, since twisting can damage the stem and invite rot.
Common Mistakes
Planting out too early. A late frost or even a cold, wet spell can stunt a young plant for weeks.
Watering the leaves instead of the soil. Wet leaves invite powdery mildew later in the season.
Letting fruit grow too big. The single most common reason for a plant that “stopped producing” halfway through summer.
Skipping the feed. Leafy growth without potash rarely converts into a good crop.
Overcrowding. Restricts airflow and makes mildew far more likely by midsummer.
FAQ: Growing Courgettes in Ireland
How long does it take to grow courgettes in Ireland from seed?
From sowing indoors to first harvest typically takes 10 to 12 weeks, so a mid-April sowing should give you fruit from late June or early July.
Why are my courgette leaves turning yellow?
Usually one of three things: a watering issue, a nutrient shortfall, or in more serious cases cucumber mosaic virus, best avoided by controlling aphids early.
Can you grow courgettes in pots in Ireland?
Yes, in a large container of at least 40 litres with good drainage, though they will need more frequent watering and feeding than ones grown directly in the ground.
Why does my courgette plant have flowers but no fruit?
Almost always poor pollination. Hand-pollinate using the method above, particularly during cool or wet weather when bees are less active.
Is it too late to sow courgettes in June in Ireland?
Early June is still workable for a slightly later harvest, particularly with a fast variety, but anything sown after mid-June is racing the first autumn frosts.
Related Reading
- The Irish Kitchen Garden Calendar: Month by Month
- What to Sow in May in Ireland
- What to Sow in April in Ireland
- Slug Control for Irish Gardeners: The Complete Organic Guide
Conclusion
Growing courgettes in Ireland comes down to a handful of decisions done at the right time: sow indoors with warmth, harden off properly, give the plant room and food, and step in with hand-pollination if the bees are not doing their job. Get those right and a single plant will keep you, and probably your neighbours, in courgettes from July through to the first frosts.
