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How to Grow Bitter Melons Canada | Sowing, Protection & Harvest

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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. Source: Wikimedia Commons

8 sources cited · Verified

The short answer

Ready in
40–63 days
Site
6+ hours of sun, soil pH 5.5–6.7
Biggest risk
Powdery mildew

In the UK, bitter melons are ready to harvest 40–63 days after planting.

Bitter melons (Momordica charantia) — annual.

This is a frost-tender crop — it will not survive below about 3°C — so in UK conditions the growing year is built around starting it under cover and moving it out only once the risk has passed.

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

Soil & Growing Conditions

A yellow bitter melon flower among the leaves — “Iraca-valli (Tamil- இராசவள்ளி) (6781771169)” by Dinesh Valke from Thane, India is licensed under CC BY-SA 2.0. Source: Wikimedia Commons
“Iraca-valli (Tamil- இராசவள்ளி) (6781771169)” by Dinesh Valke from Thane, India is licensed under CC BY-SA 2.0. Source: Wikimedia Commons.

Soil pH range

5.5 6.7

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

Quick Facts

A warty bitter melon fruit hanging from the vine — “A bitter gourd hanging from Momordica charantia 2” by Billjones94 is licensed under CC BY-SA 4.0. Source: Wikimedia Commons
“A bitter gourd hanging from Momordica charantia 2” by Billjones94 is licensed under CC BY-SA 4.0. Source: Wikimedia Commons.
Factor Value
Soil pH 5.5 - 6.7
Sunlight 6-6 hours direct sun
Germination temp 21C
Optimal growing temp 22-30C
Minimum survivable temp 3C
Time to harvest 40-63 days
Drainage Fertile, well-drained
Lifecycle annual
Edible parts fruit

At a Glance

A warty bitter melon fruit hanging from the vine — “A bitter gourd hanging from Momordica charantia 2” by Billjones94 is licensed under CC BY-SA 4.0. Source: Wikimedia Commons
“A bitter gourd hanging from Momordica charantia 2” by Billjones94 is licensed under CC BY-SA 4.0. Source: Wikimedia Commons.
Momordica charantia Bitter Melon Powdery mildew Downy mildew (general) Aphids Melon fruit fly DISEASES PESTS

Growth Stages

A yellow bitter melon flower among the leaves — “Iraca-valli (Tamil- இராசவள்ளி) (6781771169)” by Dinesh Valke from Thane, India is licensed under CC BY-SA 2.0. Source: Wikimedia Commons
“Iraca-valli (Tamil- இராசவள்ளி) (6781771169)” by Dinesh Valke from Thane, India is licensed under CC BY-SA 2.0. Source: Wikimedia Commons.
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 gourd hanging from Momordica charantia” by Billjones94 is licensed under CC BY-SA 4.0. Source: Wikimedia Commons
“A bitter gourd hanging from Momordica charantia” by Billjones94 is licensed under CC BY-SA 4.0. Source: Wikimedia Commons.

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 — “Fruit of Momordica charantia 20200903” by そらみみ is licensed under CC BY-SA 4.0. Source: Wikimedia Commons
“Fruit of Momordica charantia 20200903” by そらみみ is licensed under CC BY-SA 4.0. Source: Wikimedia Commons.
Downy mildew (general)

Pests

Close-up of a ridged, warty bitter melon fruit — “Fruit of Momordica charantia 20200903” by そらみみ is licensed under CC BY-SA 4.0. Source: Wikimedia Commons
“Fruit of Momordica charantia 20200903” by そらみみ is licensed under CC BY-SA 4.0. Source: Wikimedia Commons.

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

Peer-reviewed: melon fruit fly is "the most destructive pest" of bitter gourd, with maggots feeding protected inside fruit.

Frequently Asked Questions

How long do bitter melons take to grow?

Typically 40–63 days, depending on cultivar and growing conditions.

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

Short-season growing is arithmetic before it is technique: days to maturity against frost-free days decides what will finish at all. The Canada Garden Planner does that subtraction for your region before you sow.

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SoilCommander Editorial Team

Canadian vegetable growing guides · Checked against provincial agriculture & university extension guidance

Every SoilCommander guide is written and maintained by our editorial team for real Canadian growing conditions, and checked against provincial agriculture and Canadian university extension guidance, and against frost-date and growing-season data, before publication.

Vegetable Growing Guides Canada

Last verified 2026-08-29

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