About

Calabash (; Lagenaria siceraria) is a vine in the family Cucurbitaceae which is grown for its fruit. It is native to tropical Africa, and cultivated across the tropics. It can be either harvested young to be consumed as a vegetable, or harvested mature to be dried and used as a kitchen utensil (typically as a ladle or bowl), beverage container or a musical instrument. When it is fresh, the fruit has a light green smooth skin and white flesh. It is also known as bottle gourd, white-flowered gourd, long melon, birdhouse gourd, New Guinea bean, New Guinea butter bean or Tasmania bean.

Calabash fruits have a variety of shapes: they can be huge and rounded, small and bottle-shaped, or slim and serpentine, and they can grow to be over a metre long. Rounder varieties are typically called calabash gourds (L. siceraria var. depressa). Calabash gourds can grow to great size.

How to grow it

Bottle gourds are grown by direct sowing of seeds or transplanting 15- to 20-day-old seedlings. The plant prefers well-drained, moist, organic rich soil. It requires plenty of moisture in the growing season and a warm, sunny position, sheltered from the wind. It can be cultivated in small places such as in a pot, and allowed to spread on a trellis or roof. In rural areas, many houses with thatched roofs are covered with the gourd vines. Bottle gourds grow very rapidly and their stems can reach a length of 9 m in the summer, so they need a solid support along the stem if they are to climb a pole or trellis. If planted under a tall tree, the vine may grow up to the top of the tree. To obtain more fruit, farmers sometimes cut off the tip of the vine when it has grown to 2 metres in length. This forces the plant to produce side branches that will bear flowers and yield more fruit.

The plant produces night blooming white flowers. The male flowers have long peduncles and the females have short ones with an ovary in the shape of the fruit.

Safety

Like other members of the family Cucurbitaceae, gourds contain cucurbitacins that are known to be cytotoxic at a high concentration. The tetracyclic triterpenoid cucurbitacins present in fruits and vegetables of the cucumber family are responsible for the bitter taste, and could cause stomach ulcers. In extreme cases, people have died from drinking the juice of gourds.

The toxic cases are usually due to the gourd being used to make juice, which the drinkers described as being unusually bitter. In three of the lethal cases, the victims were diabetics in their 50s and 60s. In 2018, a healthy woman in her 40s was hospitalized for severe reactions after consuming the juice and died three days later from complications.

Uses

Boiled calabash is 95% water, 4% carbohydrates, 1% protein, and contains negligible fat (table). In a reference amount of 100 grams (3.5 oz), cooked calabash supplies a moderate amount of vitamin C (10% of the Daily Value), with no other micronutrients in significant amounts (table).

Other Lagenaria plants

Wild Melon