Satsuma Onaga is a Japanese heirloom bitter melon from Kyushu Island's southwestern bay area, a region celebrated for producing some of the world's finest bitter melons. The fruit grows exceptionally long and slender, reaching 16 to 18 inches, with snake-like appearance and potent superfood qualities that shine when stir-fried or brewed into tea. From seed to harvest takes just 60 to 70 days, and the plant thrives in warm zones 2 through 11, producing abundant harvests on vigorous vines.
Full Sun
Moderate
2-11
?in H x ?in W
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Moderate
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Long, slender fruit that stretches 16 to 18 inches along the vine creates a visually striking garden presence while delivering intense bitter melon character. The plant excels in producing prolific yields of snake-like fruit, making it far more generous than shorter varieties. Its heritage from Japan's premier bitter melon region means you're growing a variety selected over generations for flavor depth and cooking performance, not a generic cultivar.
Slice the long, slender fruit and stir-fry it with complementary flavors like cooked garlic and beans, where its potent bitterness is balanced and celebrated rather than masked. The fruit also brews into a healthful tea, capturing the bitter melon's reputation as a superfood packed with beneficial compounds. Either way, Satsuma Onaga's exceptional length means you'll have plenty of fruit to experiment with multiple preparations.
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Start seeds indoors 4 to 6 weeks before your last frost date in soil warmed to 70 to 85 degrees Fahrenheit. Keep the medium consistently moist but not waterlogged until germination occurs.
Harden off seedlings gradually over 7 to 10 days, then transplant outdoors after the last frost date when soil temperature reaches at least 70 degrees. Space plants 24 inches apart in full sun.
Direct sow seeds outdoors after all frost danger has passed and soil temperature reaches 70 degrees or warmer. Sow 1/2 inch deep and thin seedlings to 24 inches apart once they've developed true leaves.
Harvest the long, slender fruit when it reaches 16 to 18 inches in length, typically 60 to 70 days after sowing. Pick fruit when the skin is still relatively firm and the flesh inside hasn't begun to soften excessively; older fruit becomes woody and less pleasant to cook. Use a sharp knife or pruners to cut the fruit cleanly from the vine, leaving a short stem attached.
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“This cultivar traces its roots to the scenic bay area of southwestern Kyushu Island, Japan, a region with a long tradition of cultivating bitter melon excellence. The Satsuma Onaga represents generations of selection for the characteristics Japanese cooks prize: exceptional length, slenderness, and the kind of balanced bitterness that works beautifully in both savory dishes and medicinal tea. The variety reached Western gardeners through seed preservation efforts that recognized its cultural and culinary importance, keeping alive a specific Japanese horticultural heritage.”