Jerusalem Artichoke

Jerusalem artichoke is a vigorous, tall-growing North American perennial in the daisy family, grown for its knobby, starchy tubers. It reliably overwinters in Nordic conditions, dying back to the ground and resprouting from remaining tubers each cycle. The plant reaches impressive heights of up to 3 metres, produces cheerful yellow sunflower-like blooms, and requires very little maintenance once established. Well-drained, composted soil promotes the best tuber development.

Growing

Plant tubers directly into well-composted, free-draining soil once the ground temperature reaches 15–16 °C. Set tubers 10 cm deep and space plants 50 cm apart in all directions. Choose a sunny position with room for the plant to reach its full height. No indoor starting is necessary — tubers establish quickly once soil is warm enough. Prepare the bed with generous organic matter before planting.

Care

Water regularly during active growth but avoid waterlogging; established plants are drought-tolerant once tall. Apply a balanced organic fertiliser when shoots emerge and again at mid-season if growth appears slow. Stake plants or position them against a windbreak if exposed to strong winds, as stems can reach 2–3 m. Cut stems back to ground level once they die down after the first hard frost. Leave some tubers in the ground to regenerate next cycle, or lift all tubers and store for replanting.

Harvest

Harvest tubers once the aerial tops have fully died down after frost — this signals the tubers are at peak starch conversion and flavour. Dig carefully with a fork to avoid damaging the irregular-shaped tubers, working outward from the base of the stem. Red-skinned varieties develop their colour after frost exposure. Continue harvesting throughout the dormant period as needed; tubers left in the ground remain viable and will re-sprout.

In the kitchen

Jerusalem artichokes can be eaten raw in salads when very fresh and thinly sliced, but cooking mellows their earthy, nutty flavour significantly. Roast them whole or halved until caramelised, boil and mash like potato, or slice into soups and stews. They pair well with cream, lemon, thyme, and mushrooms. Note that inulin in the tubers can cause digestive discomfort — cooking thoroughly and introducing them gradually helps.

Storing

After harvest, store tubers in damp sawdust, sand, or peat in a cool, dark, frost-free location; they keep well for several months under these conditions. Do not wash tubers before storing, as moisture accelerates rot. Alternatively, leave tubers in the ground and harvest as needed through the dormant period — in-ground storage is effective in areas with mild winters. Once scrubbed, refrigerate for up to 2 weeks.