How to Grow Bitter Melons UK

By the SoilCommander Editorial Team, under the guidance of Nitin Sharma, Co-Founder · · How we check our facts

On this page
  1. Bitter Melon (Momordica charantia)
  2. When to Plant Bitter Melons in the UK
  3. Quick Facts
  4. At a Glance
  5. Soil & Growing Conditions
  6. Growth Stages
  7. Harvest & Storage
  8. Diseases
  9. Pests
  10. Bitter Melon, a Rampant Warm-Season Vine
  11. Plan your Bitter Melons planting
  12. Growing Bitter Melon in another region
  13. References
  14. Frequently Asked Questions

In the UK, bitter melons go in the ground early March to early May.

Timing is the decision that matters most in the UK: sowing early March, and that same window applies across all 4 regions covered here.

The short answer

Plant
Early March to early May
Site
6+ hours of sun, soil pH 5.5–6.7
Biggest risk
Powdery mildew

Core growing advice on this page is checked against named horticultural sources — see References.

Bitter Melon (Momordica charantia)

A young bitter melon seedling grown under a rain shelter — “Bittergourd grown under rainshelter 02” by Najeeblscp is licensed under CC0.

8 sources cited · Verified

When to Plant Bitter Melons in the UK

When to plant bitter melons in the UK: in Southern England, sow early March to early May. Find your area in the table below.

A young bitter melon seedling grown under a rain shelter
A young bitter melon seedling grown under a rain shelter. Photo by Najeeblscp, CC0.
Region Sow
Southern England early March to early May
Midlands early March to early May
Northern England early March to early May
Scotland early March to early May
Southern England - detail & sources

NC State Extension: start seed indoors about 4 weeks before the last spring frost; a single window is applied uniformly across all four sub-regions since the source gives no UK-region-specific gradient for this frost-tender tropical vine.

Midlands - detail & sources

NC State Extension: start seed indoors about 4 weeks before the last spring frost; a single window is applied uniformly across all four sub-regions since the source gives no UK-region-specific gradient for this frost-tender tropical vine.

Northern England - detail & sources

NC State Extension: start seed indoors about 4 weeks before the last spring frost; a single window is applied uniformly across all four sub-regions since the source gives no UK-region-specific gradient for this frost-tender tropical vine.

Scotland - detail & sources

NC State Extension: start seed indoors about 4 weeks before the last spring frost; a single window is applied uniformly across all four sub-regions since the source gives no UK-region-specific gradient for this frost-tender tropical vine.

A page from the UK Vegetable Garden Planner PDF: the crop rotation planner, with a planning grid and four-bed rotation tips

Plan your bitter melons — and the rest of the plot

This page covers bitter melons. For every crop's sowing months on one chart, use the free UK vegetable planting calendar, and browse the UK vegetable growing guides for what else to grow alongside it. When you want the whole season on paper, the UK Vegetable Garden Planner is a printable PDF:

  • Twelve month-by-month sowing and harvest spreads
  • Raised bed, allotment and container layout pages for your own plot
  • A four-year crop rotation planner
  • Seed inventory, sowing log and harvest tracker
See inside the UK Vegetable Garden Planner →

Instant PDF download · reprint every season

Quick Facts

A warty bitter melon fruit hanging from the vine
A warty bitter melon fruit hanging from the vine. Photo by Billjones94, CC BY-SA 4.0.
Factor Value
Soil pH 5.5 - 6.7
Sunlight 6-6 hours direct sun
Germination temp 21°C
Optimal growing temp 22-30°C
Minimum survivable temp 3°C
Drainage Fertile, well-drained
Lifecycle annual
Edible parts fruit

At a Glance

A warty bitter melon fruit hanging from the vine
A warty bitter melon fruit hanging from the vine. Photo by Billjones94, CC BY-SA 4.0.
Momordica charantia Bitter Melon Powdery mildew Downy mildew (general) Aphids Melon fruit fly DISEASES PESTS

Soil & Growing Conditions

A yellow bitter melon flower among the leaves
A yellow bitter melon flower among the leaves. Photo: “Iraca-valli (Tamil- இராசவள்ளி) (6781771169)” by Dinesh Valke from Thane, India, CC BY-SA 2.0.

Soil pH range

5.5 6.7

Span reflects genuine variation between the cited authorities, not a single agreed figure.

Growth Stages

A yellow bitter melon flower among the leaves
A yellow bitter melon flower among the leaves. Photo: “Iraca-valli (Tamil- இராசவள்ளி) (6781771169)” by Dinesh Valke from Thane, India, CC BY-SA 2.0.
Stage BBCH Notes
Sowing and germination 0 Start seed indoors in peat pots that decompose in the soil, about 4 weeks prior to the last spring frost date (NC State Extension).
Planting out and establishment 1 Plant out once frost risk has passed, in full sun to partial shade with a trellis or other support in place for the climbing tendrils (NC State Extension).
Vigorous vine growth and flowering 6 Rapid climbing growth to 12-20 feet in a single season; yellow tubular flowers bloom from the upper leaf axils in summer and early fall (NC State Extension).
Fruiting and harvest 8 Harvest green or early-yellow fruit in fall and winter, before it ripens fully to yellow-orange and splits; frost-tender and killed by the first frost (NC State Extension).

Harvest & Storage

A bitter melon fruit hanging among vine leaves
A bitter melon fruit hanging among vine leaves. Photo by Billjones94, CC BY-SA 4.0.

When to pick: TSU: "Fruits are ready to harvest from 40-63 days after planting depending on the variety"; harvest "when they are 4 to 8 inches long"; "more mature fruits are not as bitter"; darker colour means more bitter and intense flavour; "Harvest fruit, when they are small and skin is green in color, they are less bitter". NC State: "Young fruits (green or early yellow colored) are a popular vegetable"; ripe fruit becomes toxic when mature and should be avoided.

Storage

Eat or freeze within a few days of harvest; degrades and molds quickly

Diseases

Close-up of a ridged, warty bitter melon fruit
Close-up of a ridged, warty bitter melon fruit. Photo by そらみみ, CC BY-SA 4.0.
Downy mildew (general)

Pests

Close-up of a ridged, warty bitter melon fruit
Close-up of a ridged, warty bitter melon fruit. Photo by そらみみ, CC BY-SA 4.0.

Aphididae (various spp.)

Bitter melon is a cucurbit affected by aphids, whiteflies and spider mites; aphids cause major yield loss via virus transmission.

Melon fruit fly

Bactrocera cucurbitae

Not present in the UK, Canada or the continental US -- within the United States it is established only in Hawaii. Where it does occur, in Asia, Africa and Oceania, it is the most destructive pest of bitter gourd, the…

Plan your Bitter Melons planting

When to sow and plant Bitter Melons depends on your own frost dates. Check the UK vegetable planting calendar. To work out where it fits in your beds, sketch your plot in the free Garden Layout Planner.

Growing Bitter Melon in another region

Sowing dates, frost timing and local advice differ by country. Use the guide for where you garden.

Frequently Asked Questions

When should I sow bitter melons in the UK?

In Southern England, from early March. In Scotland, wait until early March. Treat these as a guide rather than a fixed date — the governing rule is to sow only once frost risk has passed and temperatures are reliably warm enough.

When do I sow bitter melons?

Sow early March to early May, at around 21°C for germination.

What soil pH do bitter melons need?

A pH of about 5.5–6.7. That span reflects genuine variation between the authorities we cite rather than a single agreed figure — the References section lists each source's exact range.

What problems affect bitter melons?

Our data links 2 diseases and 2 pests to this crop. See the sections above for each one and how to manage it.

Plan next season before the problems start

Most of the advice on this page comes down to timing and spacing — sowing at the right moment, rotating beds, and giving plants enough airflow. The UK Garden Planner lays your plot out month by month so those decisions are already made before the season starts.

Get the UK Garden Planner →

Instant PDF download · Written for UK growing conditions

SoilCommander Editorial Team — under the guidance of Nitin Sharma, Co-Founder

Every growing guide is checked against RHS, USDA Cooperative Extension, and other named horticultural authorities before publishing. How we check our facts.

How this guide is put together

The growing data on this page — sowing windows, pests, diseases, soil and site requirements — comes from named horticultural sources, listed in References below, checked against RHS and Met Office guidance. An automated pipeline assembles that verified data into the page you're reading: it selects which facts to lead with and builds the surrounding prose and layout. It does not invent a date, a source or a number — where a verified value for a field isn't available, the page leaves it out rather than guessing. A person reviews and publishes each page; nothing goes live unverified.

Vegetable Growing Guides UK

Crops With the Same Problems

Related Problem Guides

Last verified 2026-08-29

Plan Bitter Melons by month

The months this guide gives for sowing or planting, each with the full list of jobs for that month in the UK:

More from the same group (squashes & cucumbers):

Relevant next steps

Where To Go From Here

Take this crop from reading into a written plan for your own beds.

UK garden plannerTurn this crop guide into sowing dates, bed layouts and a harvest record. All growing guidesBrowse every crop we cover for your region, A to Z. Planting CalendarSee how this crop fits alongside everything else you are growing.

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