How to Grow Melons from Seed in a British Greenhouse

By How to Hand-Pollinate Melon Flowers for Better Crops
Comments 35
10 Sep 2026

How to Grow Melons from Seed in a British Greenhouse

Choosing varieties that suit a British greenhouse

British summers can be generous, but they are rarely long enough or hot enough for melons to thrive outdoors. A greenhouse changes everything. It traps warmth, keeps rain off the leaves, and gives you a realistic chance of harvesting sweet, fragrant fruit. For melons, look for early varieties such as 'Charentais', 'Galia' or 'Emir'. These ripen in 80 to 100 days from sowing. Pumpkins and squash are more forgiving, but in a short-season garden choose smaller, faster types like 'Uchiki Kuri', 'Crown Prince' or 'Butternut'. Always check the seed packet for days to maturity and add a fortnight for British conditions.

Sowing melon seeds indoors in late spring

Timing is everything. Sow melon seeds from late April to mid May. Use 7cm pots filled with peat-free multipurpose compost. Push each seed on its edge about 1cm deep — this helps the shoot emerge without rotting. Water gently, then keep the pots at 18–21°C. A heated propagator or a warm windowsill above a radiator works well. Seedlings usually appear in 7 to 14 days. As soon as two true leaves appear, pot them on into 12cm pots. Grow them on in bright light, turning the pots daily so stems stay straight. Do not let compost dry out, but never leave pots standing in water.

Moving melons to the greenhouse

Wait until all danger of frost has passed — usually late May or early June in most of the UK. Harden the young plants off over a week by putting them outside in a sheltered spot for a few hours each day. Then plant them into the greenhouse border or into 30cm pots of rich compost. Space plants 45–60cm apart. Melons love to climb, so give them a sturdy vertical support: netting, wires or a bamboo frame. Pinch out the growing tip after four or five leaves to encourage sideshoots, which carry the flowers. Water regularly and feed with a high-potash tomato feed once flowers appear. Melons have separate male and female flowers. The female has a small swelling at the base; the male does not. To pollinate, pick a male flower, remove its petals, and dab the centre into the female flower. Do this in the morning. Keep the greenhouse ventilated on hot days and damp down the floor to raise humidity.

Growing pumpkins and squash in a British garden

Pumpkins and squash belong to the same family and enjoy similar treatment. Sow their seeds under cover in late April. Plant them out after the last frost, into soil enriched with plenty of garden compost or well-rotted manure. They are hungry, thirsty plants, so water deeply and mulch well. Allow 1–2m between plants, or train them up a strong frame to save space. Pinch out the growing tips once a few fruits have set. If bees are scarce, hand pollinate as you would melons. Watch out for slugs when the plants are young, and keep an eye out for powdery mildew later in the season. A weekly feed of tomato food will keep them productive.

Harvesting and ripening your crop

Melons tell you when they are ready. The fruit slips from the vine with a gentle tug, the skin changes colour, and a sweet perfume fills the greenhouse. For cantaloupe types, the netting becomes pronounced and the background turns beige. If a melon does not slip, leave it another day or two. Pumpkins and squash should be harvested before the first frost. The skin should be hard enough to resist a fingernail, and the stem should be corky. Cut with a 5cm stalk attached. Cure them in a sunny spot or a warm room for ten days, then store in a cool, dark, frost-free place. Never carry pumpkins by their stem — it can snap and invite rot.

Cooking and storing your harvest

Melons are best eaten fresh, chilled, perhaps with a slice of ham or a handful of mint. They also blend beautifully into smoothies or fruit salads. Pumpkins and squash are wonderfully versatile. Try these easy ideas:

Roast wedges with olive oil, garlic and rosemary.
Make a creamy soup with onion, stock and a swirl of cream.
Add cubes to curries, risottos or pasta sauces.

The seeds are a bonus: rinse them, dry them, toss with salt and roast until golden. Store melons in the fridge for up to a week. Pumpkins and squash will keep for several months in a cool, dark room. Check them regularly and remove any that start to soften. With a little care, your British greenhouse can deliver a taste of late summer right through to winter.

Melon Growing

Recognising Ripe Melons: Signs to Look For

Some melon varieties ripen better in short seasons. Look for early, reliable types that tolerate cooler nights and limited sunshine.

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5 Comments

Robert Sonny says Jul 21, 2024 at 10:00am

I must explain to you how all this mistaken idea of denouncing pleasure and praising pain was born and I will give you a complete account of the system
Reply
- John Abraham says Jul 21, 2024 at 10:00am
  
  I must explain to you how all this mistaken idea of denouncing pleasure and praising pain was born and I will give you a complete account of the system
  Reply
  - Robert Sonnysays Jul 21, 2024 at 10:00am
    
    I must explain to you how all this mistaken idea of denouncing pleasure and praising pain was born and I will give you a complete account of the system
    Reply
Robert Sonny says Jul 21, 2024 at 10:00am

I must explain to you how all this mistaken idea of denouncing pleasure and praising pain was born and I will give you a complete account of the system
Reply

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