Potato

The potato is a starchy tuberous vegetable native to South America and one of the world's most important staple crops. It produces underground stem tubers in a wide range of shapes, sizes, skin colours, and flesh textures — from floury russets to waxy fingerlings. Potatoes thrive in cool, fertile, well-drained soil and prefer full sun. Varieties range from quick-maturing new potatoes to late-season storage types.

Growing

Plant certified seed tubers or sets with at least one eye per piece. Place tubers 10 cm deep in loose, well-worked soil once the soil temperature has reached at least 7 °C and night air temperatures stay reliably above 7 °C. Space tubers 30 cm apart in rows 75–90 cm apart. Begin hilling soil up around the emerging stems when plants reach 15–20 cm, repeating as they grow to prevent tubers from greening and to encourage a larger crop.

Care

Keep soil evenly moist, especially once plants flower and tubers are forming — uneven watering leads to hollow heart and cracking. Apply a balanced fertiliser at planting and a second feed once plants are established; avoid excess nitrogen late in the season, which promotes foliage over tubers. Hill the soil up around stems two to three times during the growing period. Monitor for potato beetle, blight, and scab; remove affected foliage promptly and ensure good air circulation.

Harvest

Harvest new potatoes once plants begin to flower, checking gently by hand beneath the plant. For main-crop storage potatoes, wait until the foliage dies back completely, then leave tubers in the ground for a further 10–14 days to allow skins to set. Dig with a fork, working outward from the plant to avoid spearing tubers. Fingerling varieties that are harvested as new potatoes should be handled gently to avoid skinning.

In the kitchen

Potatoes are extraordinarily versatile: boil, steam, bake, roast, fry, or mash. Waxy varieties hold their shape when boiled and are ideal for salads and roasting; floury varieties produce fluffy baked potatoes, light mash, and crisp chips. Red- and purple-fleshed varieties add striking colour to salads and retain much of their pigment when steamed or roasted rather than boiled.

Storing

Cure freshly dug potatoes at 10–15 °C with good air circulation for one to two weeks to toughen skins. Store cured potatoes in a dark, cool (4–8 °C), humid, well-ventilated location — a root cellar or unheated basement is ideal. Avoid temperatures below 4 °C, which convert starch to sugar. Most main-crop varieties keep for several months; new potatoes and waxy types should be eaten within a few weeks. Never store potatoes in the refrigerator or in light, which causes greening and solanine accumulation.