Okra is an annual sub-shrub closely related to cotton and hibiscus. It originates from tropical Africa but is now widely cultivated in many countries for its immature seedpods, which are cooked and eaten as a vegetable.
It typically grows 1 to 2 m (3 to 6 ft) tall with a single unbranched stem bearing large green, deeply lobed heart-shaped leaves.
Flowers hibiscus-like with pale yellow petals and purple centres. These are followed by long, ribbed green seedpods, less commonly wine-red, becoming dry and brown when mature with several small round seed inside.
The seedpods are harvested when young and when the tips can be easily pinched-off without resistance. They are steamed, boiled, fried, made into chips or are pickled. In New Orleans, it is the central ingredient in Jambalaya, a Creole dish of okra, rice, freshwater crayfish and various meats.
The immature seedpods are also used for their mucilage properties to thicken sauces, curries, soups and stews, including the famous Gumbo stews of Louisiana, in the southern United States. They are an essential ingredient in steamed seafood dishes in the West Indies and are found for sale as a fried chip or crisp snack food in India and Southeast Asia.
The seed from seedpods left to mature and dry on the plant can be pressed to extract an edible oil, or can be ground into a flour that is rich in fibre, fats and protein (around 22% of the seed dry weight). Seed oil content ranges from 15 to 22% of the seed dry weight, with the expressed oil being greenish-yellow with an agreeable flavour and aroma. The mature seed also make an excellent poultry feed.
The stems with the seedpods intact, as well as singular seedpods are sometimes dried for use in floral arrangements.
Dried okra chips or crisps (Singapore)
The young seedpods are high in fibre as well as having good levels of Vitamin C (Ascorbic acid) and some Folate.
Okra is grown as an annual in warm temperate, subtropical and tropical climates, generally areas with annual lows of 9 to 25°C, annual highs of 20 to 37°C and annual rainfall of 500 to 3000 mm.
Okra plants may fail to flower and fruit, or do so poorly, in areas where the average low of the warmest month is below 16°C (61°F), such as in tropical highland areas above 1000 m (3300 ft) elevation.
The seed are best sown in spring to early summer in subtropical areas and toward the end of the rainy season in tropical areas (leading into the drier, cooler months), when there is sufficient soil moisture for good germination and growth.
The planting site should have full to partial sun exposure and the soil in which the seed is sown should be a free-draining clay, loam or sand that has been enriched with organic matter and adjusted to have a moderately acid to neutral pH, generally in the 5.5 to 7.5 range.
Okra is listed in one or more reference publications as having escaped cultivation and a weed of agriculture, but there does not appear to be any record of it as a serious weed anywhere in the world.
The fine hairs on the stems and seedpods are an irritant for some people and may cause them dermatitis on contact.
Editors of Sunset Magazine 2012, The New Western Garden Book: The Ultimate Gardening Guide, 9th edition, Sunset Publishing Corporation, California
Gohl, B. 1981, Tropical Feeds : feed information summaries and nutritive values (Revised edition), Food and Agriculture Organization of the United Nations (FAO), Rome
Grubben, G.J.H. & Denton, O.A. (Editors) 2004, Plant Resources of Tropical Africa, Volume 2 : Vegetables, PROTA Foundation, Backhuys Publishers, Leiden
Jamieson, G. S. 1943, Vegetable fats and oils : their chemistry, production, and utilization for edible, medicinal and technical purposes, 2d ed, Reinhold, New York
National Research Council (Board on Science and Technology for International Development) 2006, Lost Crops of Africa: Volume II: Vegetables, The National Academies Press, Washington D.C.
Norrington, L. & Campbell, C. 2001, Tropical food gardens : a guide to growing fruit, herbs and vegetables in tropical and sub-tropical climates, Bloomings Books, Hawthorn, Victoria
Parrotta, J. A. 2001, Healing plants of peninsular India, CABI Publishing, Wallingford, Oxfordshire
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Winters, H. F & Miskimen, G. W. 1967, Vegetable gardening in the Caribbean area, U.S. Dept of Agriculture, Washington D.C.
Morton, J.F. 1964, Honeybee Plants of South Florida, Proceedings of the Florida State Horticultural Society, Vol 77:415-436.
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