Cucumis melo
Growing your own melon is one of the ultimate kitchen garden challenges — and rewards. A perfectly ripened home-grown melon picked at the precise moment it is ready has an intensity of flavour and fragrance that no shop melon can approach. They need greenhouse or polytunnel conditions in the UK, but within those constraints, they are entirely achievable with the right variety and consistent management.
The number of varieties shown for each crop is based on UK consumption data (2025/26) — the more popular the crop, the more variety choices we include.
The most reliable UK greenhouse melon. Pale green ribbed skin with salmon-orange flesh. Very sweet, aromatic flavour. Consistently productive in UK conditions. The first choice for any UK melon grower.
One of the earliest and most reliable UK cantaloupe melons. Excellent for cooler UK summers when later varieties may not ripen. Good, sweet flavour. Orange flesh. A reliable choice for northern UK gardens with shorter growing seasons.
A heritage British variety with an outstanding reputation for flavour — rich, aromatic salmon-pink flesh with genuine complexity. Needs more warmth than modern F1 varieties. In a warm summer or heated greenhouse, it produces extraordinary fruit. A connoisseur choice.
An Israeli-bred Galia-type with pale green skin and very sweet green flesh. Excellent flavour. Reliable in UK polytunnels. One of the best varieties for polytunnel rather than greenhouse growing where temperatures are slightly lower.
An heirloom variety with extraordinary aromatic intensity — the fragrance fills a room when ripe. Distinctive pineapple-like notes in the flavour. Needs a warm summer but produces memorable fruit. A specialist choice for experienced melon growers.
A traditional French variety well-adapted to cooler climates. Small, round, grey-green skinned fruit with salmon-orange flesh. Very sweet. Earlier ripening than many varieties. A good choice for the UK's shorter growing season and reliable polytunnel growing.
A Charentais-type melon with the classic rich, aromatic flavour of French market melons. F1 hybrid giving reliable performance. Orange-fleshed, ribbed skin. Outstanding flavour when ripe. A premium choice for those who want the quality of a southern France melon from a UK greenhouse.
A Spanish-type melon with green-white flesh and mild, sweet flavour. Keeps for 2–3 weeks after picking — much longer than cantaloupe types. Needs a long, warm growing season. Best in heated greenhouses or exceptional UK summers in the south.
The earliest and most cold-tolerant melon variety available — bred in Minnesota for northern US growing conditions. Very small but sweet fruit. Compact plant. The most reliable choice for northern UK gardens and cooler greenhouse conditions where other varieties struggle to ripen.
Melon seed is widely available from all major UK seed suppliers, with F1 varieties bred for cooler climates (Sweetheart F1, Alvaro F1) the most reliable choice for an unheated greenhouse or polytunnel. Minnesota Midget and other compact varieties suited to smaller spaces are best found through specialist or heirloom seed suppliers.
Sow one seed per 9cm pot on its side (reduces rotting) at 20–25°C. Germination in 5–10 days. Grow on at minimum 18°C. A heated propagator is strongly recommended — windowsill temperatures are often insufficient for reliable germination.
Pot on into a 15cm pot when roots fill the 9cm pot. Harden off gradually over 7–10 days before planting into the greenhouse. Never plant out if soil temperature is below 18°C.
Plant 90cm apart into beds enriched with generous compost. Alternatively plant in 30L+ containers of compost-rich growing medium. Install vertical strings or canes for training.
Tie the main stem to a vertical string or cane. When 5–6 leaves have developed, pinch out the growing tip to encourage lateral (side) shoots — these carry the female flowers and fruit.
Female flowers have a tiny embryo melon behind the petals; male flowers have a plain stalk. Transfer pollen from male to female with a soft brush at midday when pollen flows freely. Pollinate all open female flowers on the same day for even fruit development.
Allow 2 fruits per plant in the UK (4 in an ideal warm summer). Support each developing fruit in a net bag or stocking tied to the overhead framework — a ripe melon weighs 1–2kg and will break the stem without support.
Grown nearby in the greenhouse, basil is thought to repel aphids and whitefly.
Marigolds are thought to deter nematodes and attract pollinators and predatory insects.
Place seed on its side in a 9cm pot of compost at 20–25°C. One seed per pot. Germination 5–10 days. Grow on at minimum 18°C night temperature.
Mid-April is early enough. Plants sown too early in March become rootbound and stressed before greenhouse temperatures are adequate for planting out.
| Region | Sow / plant | Harvest | Notes |
|---|---|---|---|
| Scotland & Far North | Apr–May | Aug–Sep | |
| Northern England | Apr–May | Aug–Sep | |
| Midlands & Wales | Apr–May | Aug–Sep | |
| Ireland & Isle of Man | Apr–May | Aug–Sep | |
| South & SE England | Apr–May | Aug–Sep | |
| South Coast & SW | Apr–May | Aug–Sep |
Melons are always grown from seed, sown annually in heated conditions. They cannot be propagated vegetatively in normal garden practice.
Heated Propagator Required — Sow in a heated propagator at 20–25°C. A propagator with a thermostat maintains the correct temperature regardless of ambient conditions. Without reliable heat, germination is slow and erratic.
Not Reliable — Without a heated propagator, melon germination at UK spring temperatures (often 10–15°C on a windowsill) is unreliable. A heat mat or propagator is strongly recommended.
Standard unheated propagator — A lidded seed tray traps warmth and humidity around germinating seeds without electricity. Performance depends entirely on room temperature — best placed on a warm windowsill and used from March onwards. Replace the lid promptly after watering. Remove it completely the moment seedlings emerge to prevent damping off.
Place the flat seed on its side rather than pointed end down — this prevents the seed sitting in a pocket of moisture which can cause rot. One seed per 9cm pot of fresh, moist compost.
Check daily. Once the seed has germinated and the first true leaves appear, temperature can be reduced slightly to 18°C. Grow in maximum light to prevent etiolation (stretching).
Melon roots are sensitive to disturbance. Handle the root ball carefully when potting on. Never allow plants to become seriously pot-bound — pot on as soon as roots appear at the drainage holes.
Bees rarely visit greenhouse melons in adequate numbers for reliable pollination. Hand pollination is essential. Identify male flowers (slender stalk, no fruit behind) and female flowers (visible embryo melon behind petals). At midday when pollen is most freely shed, use a soft artist's brush to collect pollen from male flowers and transfer to the stigma of the female flowers. Pollinate all open female flowers at the same time — this ensures fruits develop at the same rate, making ripeness judgement more straightforward. One successful pollination session per flower cluster is usually sufficient.
Consistent warmth is the single most important factor for melon success in the UK. Maintain a minimum night temperature of 18°C and a daytime target of 25–30°C. In practice, an unheated polytunnel or greenhouse achieves these temperatures in a warm UK summer from May onwards. In cool summers, supplementary heating is needed. Open ventilators during the hottest part of the day to prevent temperatures exceeding 35°C — above this, plants stop growing and flowers abort. A maximum-minimum thermometer inside the growing structure allows accurate temperature monitoring.
Water consistently at the base — never overhead, as wet foliage invites powdery mildew. Keep soil evenly moist but never waterlogged. Inconsistent watering causes fruit cracking and aborting. From fruit set, water regularly and feed weekly with a high-potash liquid fertiliser. In the 2 weeks before expected ripeness, reduce watering slightly to concentrate sugars in the developing fruit.
Judging melon ripeness is the most skilled aspect of growing them. Signs of readiness: an intense, sweet fragrance develops at the stalk end; the skin softens slightly to gentle finger pressure near the stalk; the stalk begins to crack and separate from the fruit naturally; the skin colour may change (variety-dependent). Do not rely on any single sign — use all of them together. A melon picked one week too early is disappointing; a perfectly ripe home-grown melon is one of the finest things a kitchen garden can produce.
Powdery mildew coats leaves in white powder in warm, dry conditions — ensure good ventilation and water at the base. Aphids colonise shoot tips — treat with soap spray. Red spider mite thrives in hot, dry greenhouse conditions — mist the leaves or introduce predatory mites. Botrytis (grey mould) on fruits in humid conditions — improve ventilation and remove affected fruit immediately. Root rot from overwatering is rapidly fatal.
Full identification and treatment advice is in the Pests and Diseases sections.
A home-grown melon at perfect ripeness should be eaten the same day or at most the following day. Once ripe, refrigerate for up to 3 days. Serve at room temperature — cold melon loses most of its fragrance. Cut open just before eating. The eating quality of a perfectly ripe home-grown melon versus any shop product is simply not comparable.
The classic Italian combination of ripe melon with thin-sliced cured ham (prosciutto, serrano, or similar) is perhaps the finest single use of a home-grown melon. The salty-sweet contrast suits any ripe variety. Serve at room temperature, never cold. Also outstanding: melon with feta and mint, melon sorbet, and chilled melon soup.
Surplus melon flesh can be puréed, sweetened with a little icing sugar and a squeeze of lime, and frozen as sorbet. Freeze in a shallow container and fork through regularly as it freezes to produce a granita, or churn in an ice cream maker. Melon sorbet from home-grown fruit captures the extraordinary fragrance even after freezing.
For UK greenhouse and polytunnel growing, Sweetheart F1 consistently outperforms other varieties in reliability, earliness, and fruit quality. It is the first choice for anyone starting with melons.
This advice appears multiple times because it is the single most important yield decision. Two large, perfectly ripened melons from a plant are infinitely more satisfying than four or six that never fully develop. Be decisive — remove excess fruits when small.
A polytunnel provides better melon-growing conditions than a traditional greenhouse — the higher volume of air, greater soil area, and ability to control ventilation along the full length creates more uniform temperature conditions. In a warm UK summer, a polytunnel in a sunny, sheltered garden produces reliably excellent results.