Jerusalem artichokes are one of the toughest, most productive crops you can grow in a UK garden — here's how to plant, contain and harvest this perennial tuber without letting it take over the plot.
Last updated 12 July 2026
Jerusalem artichokes grow tall and spread fast, so plan their spot carefully — our UK vegetable garden layout guide is worth reading before you plant.
Jerusalem artichokes (Helianthus tuberosus) are a sunflower relative grown for their knobbly, nutty-flavoured tubers rather than their flowers, and they are close to indestructible in a UK garden. Give them a spot and they will crop reliably every year with almost no input — the challenge with this crop is not getting it to grow, but stopping it from spreading further than you intended. This guide covers how to plant, contain and harvest Jerusalem artichokes successfully in UK conditions.
What Are Jerusalem Artichokes
Despite the name, Jerusalem artichokes have no connection to Jerusalem or to globe artichokes — the name is thought to be a corruption of "girasole", the Italian word for sunflower, since the plant produces tall yellow flowers close to a small sunflower. Underground, it forms clusters of knobbly, pale-skinned tubers similar in size and texture to a small potato or piece of ginger, with a sweet, nutty flavour once cooked. It is a true perennial: any tuber left in the ground over winter will resprout the following spring, which is central to both how easy it is to grow and how carefully it needs to be managed.
Planting Jerusalem Artichokes in the UK
Plant tubers in March or April, once the worst frosts have passed and the soil has begun to warm. Choose tubers about the size of a hen's egg — cut larger ones into pieces with at least one growing eye, similar to seed potatoes. Plant 10–15cm deep and 30–45cm apart within a row, with rows spaced at least 90cm apart to give the tall stems room and to make earthing up and harvesting easier later on.
Any well-drained soil suits Jerusalem artichokes, including poor or stony ground that struggles to grow much else — this is a crop that thrives on neglect rather than pampering. Avoid waterlogged sites, where tubers are more prone to rotting over winter.
Grower's note: plants commonly reach 2.5–3m tall by late summer. The Royal Horticultural Society notes this height makes them a useful seasonal windbreak or screen for a vegetable plot — but plant them on the north side of other crops so they don't shade out shorter neighbours.
Regional Timing: South vs North
In the milder south of England, tubers can go in as early as mid-March in a well-drained bed. Further north and in Scotland, where the soil is slower to warm and late frosts linger, it's safer to wait until April. The plants are hardy once established and shrug off all but the most severe cold, so a slightly later planting date costs little — what matters more is avoiding ground that is still cold and wet, which encourages the tubers to rot before they can shoot.
Growing and Caring for Jerusalem Artichokes
Once established, this crop asks for very little. Water young plants during dry spells in their first few weeks, but established plants rarely need extra watering even in a dry UK summer, thanks to their deep root system. On exposed or windy sites, earth up the base of the stems in early summer, or cut plants back to around 1.5m in July, to reduce the risk of wind rock loosening the roots and toppling the tall stems.
Stopping Jerusalem Artichokes From Spreading
This is the single most important part of growing Jerusalem artichokes well. Every tuber left in the soil at harvest — and it is almost impossible to lift every single one — will regrow the following spring, so an unmanaged bed steadily expands year after year. Growers who skip this step often find the crop has colonised half the plot within three or four seasons.
To keep it contained: grow in a dedicated bed edged with buried barrier board or old paving slabs sunk 30–40cm into the ground, or grow in large builder's tubs or sunken bottomless barrels if space is tight. Whichever method you use, dig over the bed thoroughly at harvest time and remove every tuber you can find, then keep an eye out for stray shoots the following spring so you can lift and eat any escapees before they establish. If you're still working out where a spreading perennial like this fits alongside your other beds, our garden layout guide covers positioning permanent and semi-permanent crops sensibly.
Pests and Diseases
Jerusalem artichokes are remarkably trouble-free. Slugs can damage young shoots in a wet spring, so protect emerging growth the same way you would for other vulnerable seedlings. The main disease risk is sclerotinia (a white, cottony rot), which is more likely on badly drained or waterlogged ground and is best avoided by good drainage and rotating the bed every few years rather than growing on the same spot indefinitely. For a broader look at UK pest and disease issues across the vegetable plot, see our garden problems, pests and diseases hub.
Harvesting Jerusalem Artichokes
Tubers are ready to lift from October through to March, once the tall stems have died back after the first frosts. Unlike most crops, there's no rush — Jerusalem artichokes are hardy in the ground and actually improve in flavour after a frost, as cold temperatures convert some of the stored inulin into sugars. Many UK growers simply leave the crop in the ground and lift tubers as needed through winter, digging only what will be used within a week or two.
Lift with a fork rather than a spade to avoid slicing through tubers, working carefully outward from the base of each dead stem since tubers can spread further than the stem's footprint suggests.
Storing and Using Jerusalem Artichokes
Jerusalem artichoke tubers don't store as well out of the ground as potatoes do — their thin skin means they dry out and shrivel within a week or two at room temperature. For that reason, "storage in the ground" is the standard UK approach: lift only what you need through the winter months. If you do need to lift a batch at once, keep tubers unwashed in a box of slightly damp sand in a cool shed or garage, similar to how you'd store maincrop potatoes, and use within a few weeks. Scrub rather than peel before cooking, since much of the flavour and nutrition sits close to the skin — roasted, they turn sweet and nutty, and they make a good alternative base for soup.
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Get the UK Garden Planner →Frequently Asked Questions
When should I plant Jerusalem artichokes in the UK?
Plant tubers in March or April once the worst frosts have passed and soil has begun to warm. In the south this can start from mid-March; further north and in Scotland, wait until April to avoid tubers rotting in cold, wet ground.
How do I stop Jerusalem artichokes from taking over my garden?
Grow them in a dedicated bed edged with buried barrier board sunk 30–40cm deep, or in large sunken containers. Dig over thoroughly at harvest to remove every tuber you can find, and lift any stray shoots that appear the following spring before they establish.
When do you harvest Jerusalem artichokes?
From October through to March, after the tall stems have died back following the first frosts. There's no rush to lift the whole crop at once — tubers are hardy in the ground and improve in flavour after frost, so most UK growers lift them gradually through winter as needed.
How do you store Jerusalem artichokes after harvest?
They don't store well out of the ground, drying out within a week or two, so the standard approach is to leave them in the soil and lift only what you need. If you must lift a batch, keep unwashed tubers in a box of slightly damp sand in a cool shed and use within a few weeks.
Do Jerusalem artichokes need a lot of care?
No — they're one of the lowest-maintenance crops you can grow. Water young plants in dry spells, earth up or cut back tall stems on windy sites to prevent wind rock, and otherwise they largely look after themselves.
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