Spinach

Spinach (Spinacia oleracea) is a leafy vegetable in the Amaranthaceae family, which also includes beetroot and chard. It is an annual plant, although some varieties can behave as biennials under certain conditions. Spinach forms a low rosette of soft leaves and grows best in cool weather. As temperatures rise and the plant approaches maturity, it may produce a flowering stem, a process known as bolting.

The leaves can be smooth or slightly crinkled, depending on the variety, and are harvested before or around the beginning of flowering. Spinach prefers fertile, well-drained soil with sufficient moisture. It can be grown in spring or autumn in many climates, while high temperatures may reduce leaf quality and encourage early bolting. Spinach can be eaten raw in salads or cooked in soups, sauces, omelets and many other dishes.

Its leaves contain water, dietary fiber, folate, vitamin K, vitamin A precursors and several minerals, including iron and magnesium. Spinach also contains oxalates, natural compounds that can bind minerals such as calcium and reduce their absorption. Cooking, especially boiling followed by discarding the cooking water, can reduce the oxalate content, although it may also lower some water-soluble vitamins.

Fresh spinach is delicate and is best kept refrigerated and used relatively soon after purchase or harvest. The leaves can be eaten young or more mature, with differences in texture and flavor. Because it grows quickly and needs relatively little space, spinach is a practical crop for many home gardens.