Wax Gourd
Benincasa hispida
The Wax Gourd (Benincasa hispida), also known as Ash Gourd, Winter Melon, or Petha, is a large, trailing vine in the Cucurbitaceae producing massive, cylindrical, wax-coated fruits that can weigh 10 to 40 kg. One of the most important vegetables in tropical Asian cuisines, the mild-flavored white flesh is used in soups, curries, and preserves across India, China, and Southeast Asia.
• The fruit develops a distinctive white, waxy coating (bloom) on its surface as it matures — hence the name "Wax Gourd"
• Also called "Winter Melon" because the hard-rinded fruits can be stored through winter
• In India, the crystallized fruit ("petha") is a famous sweet from the city of Agra, home of the Taj Mahal
• One of the largest edible fruits — individual specimens can exceed 40 kg
• The mild, slightly sweet flesh absorbs flavors readily, making it an ideal vehicle for curries and soups
• Originated in the Indo-Malayan region, likely in India or Southeast Asia
• Cultivated in China for at least 2,000 years — mentioned in ancient Chinese agricultural texts
• In Indian Ayurvedic medicine, the fruit has been used for centuries as a cooling, diuretic food
• The genus Benincasa is monotypic — B. hispida is the only species
• The species epithet "hispida" means "roughly hairy," describing the young fruit surface
• Now grown throughout tropical and subtropical Asia, from India to Japan
• Widely cultivated in India, China, Vietnam, Thailand, and the Philippines
Vine:
• Trailing or climbing, 3 to 10 meters long
• Coarse, angular stems with dense, bristly hairs
• Large, branched tendrils for climbing
Leaves:
• Large, broadly ovate to suborbicular, 15 to 30 cm across
• Shallowly lobed or unlobed, coarsely toothed
• Rough, hairy, dark green
Fruit:
• Large, cylindrical to oblong, 30 to 80 cm long and 20 to 40 cm in diameter
• Weight: typically 5 to 20 kg, sometimes exceeding 40 kg
• Young fruit: green, hairy
• Mature fruit: smooth, dark green to grayish-green, covered with a distinctive white, waxy bloom
• Flesh: thick (5 to 10 cm), pure white, spongy-textured, mild, and slightly sweet
• The waxy coating helps prevent moisture loss, allowing months of storage
Seeds:
• Large, flat, oval, cream to pale yellow, 1 to 1.5 cm long
• Edible when roasted
Flowers:
• Large, yellow, funnel-shaped, 5 to 10 cm across
• Male and female flowers on the same plant
Per 100 g raw flesh:
• Energy: approximately 13 kcal — extremely low calorie
• Water content: approximately 96%
• Carbohydrates: 3.0 g
• Protein: 0.4 g
• Vitamin C: significant amounts
• Potassium: moderate
• Calcium and phosphorus
• Contains triterpenoids and flavonoids with anti-inflammatory properties
• The high water and fiber content promotes hydration and digestive regularity
• Very low sodium
Planting:
• Direct-seed after all frost danger in tropical and subtropical climates
• Plant in hills or mounds, 2 to 3 seeds per hill, thinned to 1 to 2 plants
• Space hills 1.5 to 3 meters apart
Site:
• Full sun
• Rich, fertile, well-drained soil, pH 6.0 to 7.5
• Consistent moisture throughout the growing season
• Provide trellis or support for the vigorous vines, or let them trail on the ground
Care:
• Water regularly — 3 to 4 cm per week
• Mulch to retain moisture and keep fruit off the ground
• Side-dress with compost mid-season
Harvest:
• Harvest mature fruits when the white waxy coating fully develops and the rind is hard
• Harvest before frost
• Cut fruit from vine with a sharp knife, leaving a short stem
• Store in a cool, dry place — fruits can keep for 3 to 6 months thanks to the waxy coating
• In Chinese cuisine: winter melon soup (often served inside the carved-out melon shell), stir-fries, and braised dishes
• In Indian cuisine: curries, kootu, sambar, and petha (crystallized sweet)
• In Vietnamese cuisine: canh bí dao (winter melon soup with pork or shrimp)
• In Filipino cuisine: ginataang kalabasa (cooked in coconut milk)
• Steamed, boiled, or stir-fried as a vegetable
• Added to hot pots and noodle soups
• Juiced as a cooling drink
• Candied as petha — Agra's famous translucent sweet
• Seeds roasted and eaten as a snack
Medicinal uses:
• In Ayurveda: used as a diuretic and cooling agent
• In TCM: clears heat, promotes urination, and reduces inflammation
• Juice applied topically for skin conditions
Fun Fact
The Wax Gourd is one of the best-storing fruits in the world — thanks to its thick rind and natural waxy coating, an intact fruit can be kept at room temperature for up to a year, making it one of the most important traditional food preservation crops in tropical Asia before refrigeration existed.
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