Jerusalem artichoke, sometimes sold as sunchoke, is a very hardy perennial sunflower grown for knobbly underground tubers. Its tall stems make a useful seasonal screen or windbreak on an allotment. Once established, it is generous and persistent, so give it a carefully chosen permanent place.

When and how to sow

Plant sound tubers in March or April, about 15 cm deep and 30 cm apart, once the ground is workable. They tolerate most soils, though a sunny site gives the strongest growth. Reserve a border, spare corner or contained bed, as overlooked tubers return readily. In colder northern areas, wait until waterlogged soil has dried sufficiently to work.

Care

Water newly planted tubers until established, then only during prolonged dry weather, particularly while tubers are swelling from midsummer onwards. They seldom need extra feeding in reasonable soil. Tall stems may need canes and ties on exposed plots. Cut down dead growth in late autumn, leaving the soil undisturbed until lifting.

Common problems

Jerusalem artichokes are usually robust, though aphids, leaf spots and mildew occasionally affect foliage late in the season. Improve air movement by avoiding overcrowding and remove diseased stems after cutting down. Their greatest problem is spread: dig thoroughly when harvesting and pull unwanted shoots as soon as they appear.

Harvest

Lift tubers from October through winter, once the stems have yellowed and died back. Use a fork carefully, as the irregular tubers are easily damaged and small pieces remain in the soil. Leave several tubers behind deliberately for next year, then lift fresh roots whenever the ground is workable.

Growing Sunchokes: frequently asked questions

When should I sow sunchokes in the UK?

Plant sound tubers in March or April, about 15 cm deep and 30 cm apart, once the ground is workable.

What are common problems when growing sunchokes?

Jerusalem artichokes are usually robust, though aphids, leaf spots and mildew occasionally affect foliage late in the season.

When is sunchokes ready to harvest?

Lift tubers from October through winter, once the stems have yellowed and died back.

General guidance for UK home gardens and allotments. Reference figures are typical values; your exact timing depends on your region, last-frost date and variety. Page updated 19 Sep 2026.