Jerusalem Artichoke care — light, water, toxicity and hardiness
Jerusalem Artichoke (Helianthus tuberosus) wants full sun and a drink about every 5 days once established. It is hardy in USDA zones 3 to 9.
| scientific name | Helianthus tuberosus |
|---|---|
| family | Asteraceae |
| category | vegetable |
| plant type | perennial |
| light | full sun |
| water cadence days | 5 |
| mature height cm | 240 |
| min zone | 3 |
| max zone | 9 |
| frost tolerant | true |
| edible | true |
How often should I water Jerusalem Artichoke?
Plant tubers once; it never leaves.
Is Jerusalem Artichoke toxic?
We do not have a verified toxicity record for this species, so we will not say either way. Treat it as unknown around pets and children until a vet or a poison-control source says otherwise.
Who eats it
Palatable to browsing animals such as deer: high. Palatable to grazing animals: high. Palatable to people: yes.
What it needs
Its shade tolerance is medium. Its moisture use is low. Its drought tolerance is high. It wants at least about 15 inches of rain a year. Above roughly 55 inches of annual rain it struggles. It tolerates soil down to pH 4.0. It tolerates soil up to pH 7.0. Its fertility requirement is medium. Adapted to coarse, sandy soils: yes. Adapted to medium, loamy soils: yes. Adapted to fine, clay soils: no. It needs at least 100 frost-free days. Its salt tolerance is low. Its tolerance of chalky soil is medium. Its fire tolerance is medium. Fire resistant: no. It has been recorded down to -43°F. It suppresses neighbours chemically: no.
How it grows
It grows as a rhizomatous form. Its growth rate is rapid. Its lifespan is moderate. It puts on most of its growth in spring and summer. It spreads by seed at a moderate rate. It spreads vegetatively at a rapid rate. It resprouts after damage: no. Coppices: no. At maturity it reaches about 9.8 feet. Its roots go down at least 6 inches. Its shape is erect. It holds its leaves through winter: no.
What it looks like
It blooms in late summer. The flowers are yellow. Conspicuous in flower: yes. The foliage is yellow-green. The foliage texture is coarse. In summer the canopy is dense in porosity. In winter it is porous in porosity. Fall colour: yes. The fruit or seed is brown. Fruit begins in summer. Fruit finishes by fall. It fruits medium. The fruit persists on the plant: no. The fruit is conspicuous: no.
Growing more of it
Propagated by seed: yes. Propagated by cuttings: no. Propagated by container: no. Propagated by bare root: no. Propagated by bulb: no. Propagated by corm: no. Propagated by tubers: yes. Cold stratification required: no. Seedling vigour is medium. Commercial availability: routinely available.
Source: Drafted from US Cooperative Extension horticulture guidance; pending HUMAN-05 review (issue 280) · 2026-09-02