Melon

Sweet, fragrant and a real test of a UK summer. Melons need more heat than cucumbers or squash: a greenhouse or sunny polytunnel gives the most reliable results, though a warm, sheltered outdoor spot can work in a good year.

Written by Yemi · Last reviewed August 2026

Waiting this month
Great for kids
First sprouts in 5–10 days at 20–25°C

Difficulty

Melon

Out of season right now. The next sowing window opens in March.

Growing Calendar

Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sow
Transplant
Harvest

This month: Oct

Plan ahead for this crop

  • •Check growing conditions
  • •Prepare for next stage

Sowing Guide

What you'd find on the seed packet

Sow Depth

1cm

Spacing

45–60cm

Germination

5–10days at 20–25°C

Thinning

Sow one seed per pot: no thinning needed

Grower's Note

Sow on their side to prevent the seed tip rotting. Bottom heat from a propagator speeds and evens up germination considerably.

Recommended Varieties

'Sweetheart' holds an RHS Award of Garden Merit and is the variety most tolerant of lower temperatures, suited to a cold frame or unheated greenhouse. 'Ogen' has no AGM but is the classic small, intensely flavoured melon, the earliest to ripen and the most forgiving of a first attempt. For organic growing, The Organic Gardening Catalogue lists 'Petit Gris de Rennes', a 17th-century French heirloom melon well suited to cooler climates and good in containers or under cover.

Planting Out Guide

Best spaces, conditions and how to plant out

Plant Spacing

45–60cm, or one plant per growbag

Best Grown In

Greenhouse borders, large pots or growbags under cover; a warm, south-facing spot outdoors in sheltered gardens

Conditions

Full sun, warm and humid. Rich, well-drained compost. Plant out only once nights are reliably above 12°C.

Grower's Note

Train up strings or canes to save space and improve airflow. Once fruits reach golf-ball size, support each one in a net sling tied to the support.

Growing Stages

Approximate weeks from sowing to harvest

Sprouting

1wks

Establishing

5wks

Maturing

12wks

Total~18 weeksfrom seed to harvest

This week for your melon

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Water

Daily

Sunlight

6+ hours direct sun

Watch Out For

Results vary a lot with the summer's heat

a genuinely hot year can ripen fruit well even outdoors, but cool, cloudy summers often fail to ripen fruit fully. A greenhouse or polytunnel gives far more reliable results regardless of the weather, since it takes the guesswork out of relying on a good summer

Powdery mildew is common from midsummer: improve airflow, avoid wetting leaves, and remove affected foliage promptly

Limit each plant to 4–5 fruits and support swelling melons in a net sling: the stem can't bear the weight alone

What You'll Need

Equipment for growing melon

Modular Seed Tray

96-cell for precision sowing

Fine Rose Watering Can

Gentle shower for seedlings

Bamboo Canes

Pack of 20 × 120cm

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Common Questions

About growing Melon in the UK

Can melons be grown outdoors in the UK?

Yes, in a warm, sheltered, south-facing spot, especially with a good summer, but results are far less reliable than under glass. A greenhouse, polytunnel, or even a cold frame placed over the plant gives the extra heat melons need to ripen fully before autumn.

Why are my melon flowers falling off without fruiting?

This is usually poor pollination. Melons produce separate male and female flowers, and cool or wet weather keeps bees away. Hand-pollinate by picking a male flower (no swelling behind the petals) and pressing it into the centre of a female flower (small melon-shaped swelling behind the petals) each morning.

How do I know when a melon is ripe?

Check the end of the fruit opposite the stem: it should give slightly when pressed and smell sweetly fragrant. Many varieties also develop a network of fine cracks near the stem, which starts to separate slightly from the fruit when fully ripe.

How many melons should I let one plant grow?

Limit each plant to 4–5 fruits. Pinch off any flowers or small fruit beyond this so the plant channels its energy into ripening a smaller number of larger, sweeter melons before the UK growing season runs out.

Written from real growing experience, organic methods only. Our story · Our approach

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