Watermelon
Citrullus lanatus (Thunb.) Matsum. & Nakai
The watermelon (Citrullus lanatus) is a trailing vine of the gourd family with a large pepo fruit with a firm rind and sweet, juicy red/pink flesh; it is grown across the tropics and originates in Africa.
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Overview
A sprawling or trailing vine with softly hairy stems and deeply lobed leaves. The flowers are yellow and unisexual, with male and female flowers separate. The fruit is a large berry (pepo) with a firm rind and no internal divisions; the flesh is sweet and juicy, usually deep red to pink, holding many seeds that are black when ripe (white when immature). Seedless (triploid, 3n) cultivars exist. The fruit can be eaten raw, juiced or pickled, and the rind is edible after cooking. Many cultivars produce mature fruit in about 100 days from sowing. Fruits vary widely in shape (elongate, oval, round) and rind colour (striped green, dark green, yellow).
The watermelon originated in the Sudan region of Africa and was domesticated and cultivated in Egypt by about 2000 BCE; wild watermelon seeds found at the Uan Muhuggiag site in Libya date to about 3500 BCE. Dessert watermelons spread across the Mediterranean world in Roman antiquity. China is today the world's largest producer. Seedless (triploid) watermelons were created in 1939. In Vietnam, watermelon is the familiar fruit of Tết (New Year) — the round fruit with red flesh symbolises luck and fulfilment — displayed and eaten fresh; watermelon juice is used to quench thirst, and the rind may be carved decoratively or pickled.
Life cycle
From seed to productPlant & leaves
A sprawling vine with deeply lobed leaves and unisexual yellow flowers.
Flowering
Male and female yellow flowers are separate; the female flower's ovary grows into the fruit.
Fruit on the vine
The large pepo has a firm rind and no internal divisions.
Ripe fruit
The flesh is red/pink, juicy and sweet, with black seeds when ripe.
Distribution & origin
Share of recorded occurrences by region- Africa (Sudan — origin, ancient Egypt)30%
- Asia (China, Turkey, Iran...)30%
- Southeast Asia · Vietnam20%
- Americas · Europe · elsewhere20%
Chemical composition
Relative content in agarwood resin- WaterMain component; refreshing88%
- CarbohydrateNatural sugars7%
- Dietary fibreSmall amount2%
- Lycopene (antioxidant)Gives the red colour; more than ripe tomatoes2%
- Vitamins & minerals (C, A, B6, K, Mg)Vitamin C, provitamin A (beta-carotene), citrulline1%
Uses
- Eaten fresh, juiced, blended; a summer thirst-quencher
- Vietnam: watermelon for Tết (round red fruit symbolising luck), displayed and eaten; decorative carving
- Rind pickled or cooked; flesh used for sorbet and frozen treats
- Nutrition: antioxidant lycopene, vitamins C and A, citrulline
Properties
- Stem
- Sprawling vine, softly hairy
- Leaf
- Deeply lobed
- Flower
- Yellow, unisexual
- Fruit
- Large pepo, firm rind, red/pink flesh
Habitat & conservation
A tropical and subtropical crop favouring heat and full sun, with regular water and well-drained sandy soil. In Vietnam it is commonly grown in the winter–spring crop (harvested before Tết) and the summer–autumn crop.
Conservation
Not Evaluated on the IUCN Red List. Watermelon is widely cultivated worldwide and is not threatened.
References
- 1Plants of the World Online — Citrullus lanatus (Thunb.) Matsum. & Nakai — Kew Science, 2026
- 2Watermelon (Citrullus lanatus) — mô tả, nguồn gốc, canh tác — English Wikipedia, 2026
- 3Dưa hấu — đặc điểm, lịch sử, cách dùng — Vietnamese Wikipedia, 2026
- 4FAOSTAT — Crops and livestock products (watermelons) — FAO, 2024
- 5Nguồn ảnh: Yercaud-elango (CC BY-SA 4.0) — Wikimedia Commons,
- 6Nguồn ảnh: JFVelasquez Floro (CC0) — Wikimedia Commons,
- 7Nguồn ảnh: Susan Slater (CC BY-SA 4.0) — Wikimedia Commons,
- 8Nguồn ảnh: Shixart1985 / Shoumya Chowdhury (CC BY 2.0 / CC BY-SA 4.0) — Wikimedia Commons,


