Whole and cut Siamese Bitter Melons arranged on a white background
Siamese Bitter Melons in a bowl with seeds and vines.
Siamese Bitter Melon on vine in varying maturity stages.
Siamese Bitter Melon split open revealing seeds in garden.
Whole and cut Siamese Bitter Melons arranged on a white background
Siamese Bitter Melons in a bowl with seeds and vines.
Siamese Bitter Melon on vine in varying maturity stages.
Siamese Bitter Melon split open revealing seeds in garden.

Bitter Melon Seeds,
Siamese

4.39 Reviews#BM102 · 10 seeds
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Description

(Momordica charantia). This little fruit may be small, but it comes on with serious intensity. Originating in Thailand, formerly Siam, this semi-wild bitter melon carries a potent bitter flavor and a long reputation in Eastern traditional medicine, especially for digestion and blood sugar support. It is also regarded as a cooling food, often eaten in hot weather to balance the body against external heat. Ornamental on the vine and deeply rooted in traditional use, this is a powerful little variety with old-world medicinal character.

Plant Details

Botanical Name
Momordica charantia
Life Cycle
Annual
Growth Habit
Vining
Sun Requirement
Full sun
Days to Germinate
7–21
Days to Maturity
75–85
Planting Depth
1 in.
Plant Spacing
18–24 in.
Ideal Temperature
75–90°F
Frost Hardy
No

Growing Guide

When to Grow

Start seeds indoors 4–6 weeks before the last frost, or direct sow once soil temperatures reach 70°F or higher. This tropical vine thrives in long, warm growing seasons. If you’re not sure how to find your first and last frost dates, consult our blog post 'Our Experts Answer Questions, Share Resources.'

How to Sow and Plant

Soaking seeds overnight and nicking or splitting the tough outer seed coat may improve germination. Plant 1/2 to 1 inch deep in compost-rich soil with good drainage. Space plants 18–24 inches apart and install trellising at the time of planting to support vigorous vertical growth and ensure optimal fruit shape and access to sunlight.

How to Grow

Keep soil evenly moist, watering at the base to avoid wetting foliage. Fertilize every 3–4 weeks with a balanced organic fertilizer. Train vines on a trellis to enhance airflow and reduce disease risk. Prune excess shoots and regularly inspect for common pests like aphids and cucumber beetles.

How to Save Seeds

  • Allow fruits to fully ripen on the vine until skin turns orange and splits.
  • Remove seeds and rinse off pulp under running water.
  • Dry seeds thoroughly in a shaded, well-ventilated area for 1–2 weeks.
  • Store in a cool, dry, dark place in an airtight container.
  • Label with date and variety name for future planting.

FAQ

Can I grow Siamese bitter melon in cooler zones?

Yes, but it requires a warm growing period. Start seeds indoors and transplant after all danger of frost has passed. Use black plastic mulch or row covers to boost soil warmth early on.

What distinguishes Siamese bitter melon from other varieties?

Siamese bitter melon is known for its thinner, more deeply grooved fruits and bold, classic bitterness. It’s a favorite for stir-fries and soups across Southeast Asia due to its robust flavor.

Do Siamese bitter melons require a lot of maintenance?

With proper soil, sun, and trellising, Siamese bitter melon is relatively low-maintenance. Regular watering, light pruning, and pest monitoring are usually sufficient to maintain healthy, productive vines.

Browse our full range of bitter melon seeds.

Customer reviews

4.3 / 5 9 Reviews

What gardeners are saying

  • Nonstop pods: Vines set small melons constantly through the season.

  • Germinates well: High germination, even for those who struggled before.

  • Pollinators love it: Bees flock to the flowers; the vine is a looker too.

  • Vigorous climber: Tall vines cover a trellis or cattle panel fast.

  • Heads up: Fruits are small, about three inches, so pick plenty for a dish.

More to grow!

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