Okra

Okra (Abelmoschus esculentus (L.) Moench) is an annual, sometimes perennial herb up to 2–2.5 m tall with stiff hairs on the stem. The leaves are alternate, 10–20 cm long and broad, palmately divided into 5–7 lobes with toothed margins, and have small stipules. The flowers are bisexual and regular, 4–8 cm across, with five white to yellow petals that usually have a red or purple spot at the base, and the stamens are fused into a column; the epicalyx is lobed. The fruit is a capsule up to 15–20 cm long with a 5–9-angled cross-section, green when young, containing many round greyish seeds. It is a polyploid species (2n = 130) in the mallow family (Malvaceae), related to cotton (Gossypium) and hibiscus (Hibiscus); Linnaeus described it in 1753 as Hibiscus esculentus and Moench transferred it to the genus Abelmoschus in 1794.

According to Kew POWO, the native range of Abelmoschus esculentus is given as India; the genus Abelmoschus originated in South-East Asia, while A. esculentus is regarded as a cultigen of uncertain origin. Many horticultural and agronomic sources instead hold that okra originated in West Africa (the name 'okra' derives from Igbo) or in the Ethiopian highlands, and was cultivated by the ancient Egyptians from about the 12th century BCE; from there it spread to the Middle East, India and throughout the tropics and subtropics. Today India is the largest producer, followed by Nigeria and other West African countries, South Asia, the Middle East and the Americas. In Vietnam okra is grown mainly in the summer season in the lowlands and midlands.

Chemically, the most characteristic component of okra is its mucilage — a highly viscous acidic polysaccharide made up mainly of the monosaccharides D-galactose, L-rhamnose and galacturonic acid, together with pectin, protein and minerals. In 100 g of fresh pods there are about 8.2 g fibre, 4.9 g carbohydrate, 3.6 g protein, very little fat (0.19 g) and about 33 kcal. The pods and their extracts contain polyphenols and flavonoids: quercetin, quercetin-3-O-gentiobioside, rutin, isoquercitrin, catechin and protocatechuic acid. The seeds are rich in protein (16.8–17.4%, with reports above 40%), in oil rich in linoleic acid, in α-tocopherol and in the minerals Ca, K, Mg, Fe, Zn and Mn. Raw okra also contains some anti-nutrients such as oxalate and phytate, reduced by cooking; roasted seeds were once used as a caffeine-free coffee substitute.

Okra is an important vegetable in many tropical countries. The immature pods release mucilage when cooked, thickening stews, soups and sauces — notably the gumbo of the southern United States and South Asian curries; in Vietnam okra is boiled and dipped in fish sauce, stir-fried with garlic or cooked in soup. The roasted seeds are used as a spice, for edible oil and as a caffeine-free beverage; the young leaves are edible; the mucilage is used as a thickener, emulsifier and fat replacer in food, as a pharmaceutical excipient and in edible films. In research, the reviews by Dantas et al. (2021) and Durazzo et al. (2019) highlight the antidiabetic potential of the mucilage (inhibition of α-amylase and α-glucosidase and reduced intestinal sugar absorption); Zhu et al. (2020) systematised the structure and bioactivity of okra polysaccharides; Kwok et al. (2025) reviewed the current scientific evidence; and Fatima et al. (2024) covered mucilage extraction and applications.

Okra is considered a safe food with no notable toxicity when eaten as a vegetable. A few cautions: the pods contain oxalate, so people with calcium-oxalate kidney stones should use it in moderation; the seeds and young pod skins may cause allergy or mild irritation in sensitive people; and the stiff hairs on the stems and pods can irritate the skin at harvest. Because okra mucilage and extracts may lower blood sugar, people taking diabetes medication should monitor their blood sugar and seek medical advice before using high-dose supplements. On conservation, the species Abelmoschus esculentus has no global IUCN Red List assessment (NE) and is not listed in the CITES appendices; it is a vegetable grown throughout the tropics and subtropics and is not threatened. Nevertheless, the wild species of the genus Abelmoschus in South and South-East Asia — valuable gene sources for plant breeding — should be maintained in genebanks and conserved in situ.