Bitter Melon

Sowing: Seeds have thick, stubborn seed coats and germinate best in warm, moist soil between 60 and 95°F, so growers either direct-sow ¾ inch deep and about 20 inches apart once the ground has warmed after the last frost, or start seedlings indoors in peat pots roughly four weeks earlier and transplant them out around the same time tomatoes go into the garden. The vine grows in rich, well-drained soil with a pH near 5.5 to 6.7, in full sun to partial shade, and will die back at the first frost of autumn.

Support and feeding: Once a plant has put out four to six leaves it begins climbing by tendril and benefits from a trellis roughly six feet tall, which keeps developing fruit off damp ground where it would otherwise rot; growers who skip a trellis line the soil beneath the vines with mulch or straw instead. Soil should be kept consistently moist, and an all-purpose balanced fertilizer or compost applied every couple of weeks once the plant is established encourages steady fruiting. Because the plant carries separate male and female flowers and relies on bees for cross-pollination, gardeners without enough pollinator activity can hand-pollinate by transferring pollen from a male flower to a female bloom during the day.

Bitter melon is not troubled by many named diseases, though it is a known host for the Bactrocera tau fruit fly and can suffer from cucurbit-family problems including powdery mildew, downy mildew, rust, and various rots. Fruit rot is especially likely wherever developing fruit rests directly on wet soil, which is why trellising or a dry mulch layer underneath the vine matters; growers also sometimes wrap individual fruits in paper to shield them from insect damage.

Harvest: Fruit is picked young, while still green or just turning yellow and around 4 to 8 inches long, typically 40 to 63 days after planting depending on how it was started; picking regularly while fruit is immature keeps the flavor milder and encourages the vine to keep setting more.

Storage: Once cut, bitter melon degrades quickly and molds within a few days, so it is best eaten or frozen soon after picking. Seed can be saved by letting a few fruits ripen past the eating stage until they turn yellow-orange and split, then collecting, washing and drying the red-coated seeds for storage in a cool, dry place, where they remain viable for two to three years.

Culinary: The unripe green or lightly yellowing fruit is eaten as a vegetable across Asia, Africa, India, the Caribbean and beyond, most often stir-fried with meat or shrimp, stuffed and cooked in oil, simmered into soups, pickled, or juiced; young leafy shoot tips are also used as salad greens, and the fruit's bitterness is commonly tempered by parboiling or soaking in salt water before cooking.

Medicinal and traditional: Across a wide range of cultures the fruit, leaves, and roots have carried a long history of folk-medicine use — for example in traditional practice in China, India, Brazil, Mexico, Peru and Nicaragua, where preparations of the plant have been used for conditions ranging from digestive complaints and skin ailments to fevers and diabetes-related folk remedies.

Ornamental: Some gardeners forgo eating the fruit altogether and let the vine sprawl for its own sake, valuing its foliage, yellow flowers and showy ripening fruit, which also attracts birds.

Bitter melon's wild relatives trace to tropical Africa and Asia, with some sources also placing its native range across tropical Asia, Australasia and the Pacific. From these origins it became a widely grown vegetable crop across Asia, Africa and the Caribbean, and was later introduced further afield to Central and South America and to parts of the United States including Florida and Alabama, where it has since become established outside cultivation.