When should I plant Jerusalem artichoke tubers?

February to March, when soil is workable. Earlier is fine in mild gardens; later works but reduces the eventual crop size. They sprout once soil temperatures rise; emergence is usually from April. A single planting gives crops indefinitely if you save a few tubers each year for replanting.

Will Jerusalem artichokes take over my garden?

Yes, if uncontained. Any tuber left in the ground starts a new plant next year, and they spread aggressively. Contain the bed with a sunk barrier (paving slabs 30 cm deep, pond-liner stapled to posts, or a galvanised steel edging strip). If you've inherited a sprawling bed, dig the entire area over in March, sieving the soil to remove every tuber fragment.

Do Jerusalem artichokes really cause flatulence?

Yes — the tubers contain high levels of inulin, a fructan that humans don't digest but gut bacteria ferment, producing gas. Effects vary by individual. Introduce them gradually if new to your diet; cooking doesn't reduce the effect; some people develop tolerance over time. The fartichoke nickname is real-world experience, not folklore.

When can I harvest Jerusalem artichokes?

From October (after the first frost blackens the foliage) through to March. Lift only what you need each time — they store far better in the ground than out. The flavour is best after the first hard frost.

How big do Jerusalem artichoke plants get?

Very tall — 2–3 m from a single tuber, with a 30–50 cm spread. The yellow sunflower-like flowers appear in late summer (the plant is in the Helianthus genus, related to sunflowers). They make a good temporary windbreak or a screen for less-attractive parts of the plot.

How long does a Jerusalem artichoke bed last?

Indefinitely if you save tubers each year. Productivity stays high for 5–10 years; after that, tubers can get smaller and the bed benefits from being lifted, the soil refreshed with compost, and replanted with the best saved tubers. Move them to a fresh bed every 7–10 years to break any soil pest or disease build-up.

Jerusalem artichoke

Helianthus tuberosus

vegetable☀️ full-sun🪴 loam📏 tall🌡️ RHS H6

📋Quick Facts

Water

💧 Minimal watering

Hardiness

Zone 3-9

About

Plant Jerusalem artichoke tubers from February to March, 12 cm deep and 30 cm apart, in any sunny corner of the garden. Jerusalem artichokes are very hardy (RHS H7), shrug off any UK winter, and crop reliably with minimal care — one of the easiest perennial vegetables. The plants grow tall (2–3 m), produce small yellow sunflower-like blooms in late summer, and form a wall of foliage that's useful as a temporary screen. Lift tubers from October through to March. Contain the bed: Jerusalem artichokes spread aggressively from any tuber left in the ground and quickly become invasive — sink slates or a barrier 30 cm deep around the bed. The fartichoke digestive effect from inulin is real; introduce them gradually if new to your diet.

Top tip

Plant tubers where they can spread, and lift after frost; expect tall stems and vigorous regrowth.

Also known as: Helianthus tuberosus, Topinambour, Aardpeer, Jerusalem artichoke, Tupinambo, Topinambur

How to grow jerusalem artichoke

1
Choose tubers from a nursery (or a supermarket)
Buy seed tubers from a seed merchant in late winter, or use supermarket Jerusalem artichokes for a free start (they're not treated against sprouting). Fuseau is a smoother knobble-free cultivar; the wild type is more knobbly but more vigorous.
2
Plan for the long term
Jerusalem artichokes are perennial and quickly spread by any tuber left in the ground. Contain the bed with a sunk barrier (paving slabs 30 cm deep, or pond-liner stapled to wooden posts) at planting. Site them where the 2–3 m tall foliage won't shade other crops — back of the plot or as a temporary windbreak.
3
Plant tubers
February to March. Dig a trench 12 cm deep; set tubers 30 cm apart with shoots facing up; cover with soil; firm in. No special soil prep needed — they thrive in poor ground.
4
Forget about them
Through summer, Jerusalem artichokes need almost no care. The plants grow 2–3 m tall and shade out weeds underneath. Light watering in extreme drought helps the tubers swell but isn't usually necessary.
5
Stake or earth up in exposed sites
Tall stems can blow over in autumn storms. In exposed gardens, stake firmly, or earth up around the base in mid-summer for stability. Falling stems break easily; broken stems reduce tuber size.
6
Cut foliage when blackened
The first hard frost blackens the foliage. Cut stems down to 10 cm above the ground — the tubers are now ready to lift as needed through winter.
7
Lift through autumn–winter
From October onwards, lift tubers with a fork as you need them. They store far better in the ground than out. Lift carefully — any tuber left behind starts a new plant next year. By March, dig over the bed thoroughly to remove every fragment if you're rotating crops.
8
Save tubers for next year's planting
Reserve 10–12 of the best tubers for replanting in February. Store in damp sand in a cool shed if you must, but in-ground storage works for most UK gardens.

Common questions

Pest Resilience

4/5 — Good resilience

Very few pests; slugs may eat tubers in wet soil but damage is minor.

Companion Planting

Grows well with

Sweetcorn Runner bean Sunflower

Keep apart from

Potato Tomato

Visual Characteristics

Fruits

Yes

Harvest: Autumn / fall to winter

🍳

Culinary

Culinary Use

Roasted, soups, mashed, gratin, pickled, chips, sautéed

The jerusalem artichoke year in your garden

Dispatching imaginary bots to check your garden out...

What to do now

How to Propagate

🌱Tuber

Moderate

Hardiness Zones

H1a (tender)H7 (very hardy)

H1a

H1b

H1c

RHS H6

USDA 5–6 equivalent