When is the best time to harvest sunchokes?

Tubers can be harvested in the fall after the foliage dies back, or left in the ground over winter and harvested in early spring.

How do I control their spread?

Plant them in containers, or in an area where their vigorous growth is desired. Digging up tubers in fall can help manage spread.

Can sunchokes be grown in containers?

Yes, but choose a large container (at least 15-20 gallons) to accommodate root growth and prevent escape.

Why are my sunchokes not flowering?

Flowering is dependent on day length; shorter days in late summer and fall trigger blooming. Ensure they have enough sun.

Are sunchokes related to potatoes?

No, sunchokes are part of the sunflower family (Asteraceae), while potatoes are in the nightshade family (Solanaceae).

Plant guide

Jerusalem artichoke.

Helianthus tuberosus

Pronounced hel-ee-AN-thus too-ber-OH-sus

Also known as Earth apple, Earth-apple, Girasole, Jerusalem Artichoke, Canada Potato, Jerusalem Artichoke, Jerusalem-artichoke

Jerusalem artichokes are a North American native sunflower species grown for their edible tubers. They produce abundant, crisp tubers that taste nutty and sweet, reminiscent of water chestnuts. This plant is a vigorous grower and can spread readily, so consider its placement carefully.

At a glance

Care level: Easy
Plant type: Perennial vegetable
Light: Full sun
Indoor light: direct
Water: Every 7 to 14 days
Mature size: Up to 3 meters tall
Growth rate: fast
Hardiness: USDA 3 to 9
Bloom time: Late summer to fall

Care

Plant tubers in well-draining soil and provide full sun. Water regularly, especially during dry spells, and be prepared for its vigorous spreading habit. Harvest tubers in fall or winter after the foliage dies back.

Watering: Water regularly, keeping soil consistently moist but not waterlogged, especially during tuber development.
Feeding: Generally does not require heavy feeding; a light compost application in spring is usually sufficient.
Pruning: Cut back dead foliage in late fall or early spring before new growth emerges.
Repotting: Division is typically done when plants become overcrowded or to manage spread, usually in early spring.
Soil: Well-draining soil
Soil pH: Slightly acidic to neutral (6.0 to 7.0)
Temperature: -34 to 35°C
Humidity: 40 to 60%
Drought tolerance: high
Lifespan: Perennial, spreads aggressively via tubers.
Deer and rabbits: low

Signs it needs repotting

Roots circling the pot and emerging from drainage holes.
Plant growth appears stunted despite adequate watering and light.
Soil dries out extremely quickly after watering.
Plant seems top-heavy and unstable in its current container.

Safety

People: The tubers are edible when cooked, but can cause digestive upset due to high inulin content. No other parts are typically consumed.
Pets: Non-toxic to cats and dogs.
Children: The tubers are generally safe, but small children might choke on raw or large pieces. Ensure tubers are cooked and cut into manageable sizes.
Contact allergens: Some individuals may experience skin irritation from contact with the sap or leaves.
Airborne allergens: Pollen can be a mild allergen for some people, especially during late summer and fall.
Edibility: While the tubers are edible, they can cause significant gas and bloating due to their inulin content. Cook thoroughly and consume in moderation.

How to identify it

Tall, upright, hairy stems
Large, rough, toothed leaves
Bright yellow, daisy-like flowers
Edible, knobby tubers underground
Sunflower family member

Height: 1.8 to 3m
Spread: 0.6 to 1.2m
Leaves: Green, deciduous
Flowers: Yellow, 5 to 10cm

Common problems

Jerusalem Artichoke Aphid — Small, green to black insects that cluster on new growth, weakening the plant and potentially spreading disease.
Powdery Mildew — A white, powdery coating on leaves and stems, common in humid conditions or when plants are overcrowded.
Rust — Orange to reddish-brown spots on leaves and stems, which can cause premature leaf drop.
Sclerotinia Stem Rot — Causes wilting and a white, cottony mold on the stem, often near the soil line.
Invasive Spreading — Tubers can spread aggressively through rhizomes, making them difficult to contain in garden settings.

Growing it

Propagation: Division, Tubers
When to plant: Spring
Overwintering: In colder climates, the tubers are hardy and can be left in the ground to overwinter. Mulching can offer extra protection. In milder climates, they may remain evergreen or resprout readily from any remaining tuber fragments.
In containers: Can be grown in containers, but requires a very large pot (at least 15-20 gallons) to accommodate its root system and prevent escape.

Division of Tubers

In early spring, before new growth begins, carefully dig up the plant.
Separate the tubers, ensuring each piece has at least one 'eye' or bud.
Replant the desired tubers in their new location, about 4-6 inches deep.
Water well after planting.

Seed

Collect seeds from mature flower heads in the fall.
Stratify seeds by storing them in the refrigerator with moist sand for 60-90 days.
Sow seeds in early spring in pots or directly in the garden.
Keep soil consistently moist until germination.

Plant Jerusalem artichokes where their vigorous growth won't be stifled and where they can provide support or benefit from companions.

Grows well with

Corn — Corn provides a natural trellis for the tall stalks of Jerusalem artichokes, and they can benefit from the shade cast by the corn.
Beans — Legumes fix nitrogen in the soil, which can benefit the nutrient-hungry Jerusalem artichoke.
Squash — The large leaves of squash can help shade the base of the Jerusalem artichoke, keeping the soil cooler and moister.

Keep away from

Mint — Mints are vigorous spreaders that can compete aggressively with Jerusalem artichokes for space and nutrients.
Brambles — Raspberries and blackberries can overgrow and shade out Jerusalem artichokes, hindering their growth.

Similar species

Jerusalem Sage — Despite the similar common name, this is an entirely different plant in the mint family, grown for its ornamental spikes and drought tolerance.
Sunflower — This is the common sunflower, grown for its large flower heads and seeds, not its edible tubers.

Science

Family: Asteraceae
Genus: Helianthus
Order: Asterales
Class: Magnoliopsida
Native range: Eastern North America.
Conservation: Not of conservation concern.

It thrives in open, sunny fields and disturbed areas, spreading via underground rhizomes and producing seeds that can be dispersed by wildlife.

Value to wildlife: nectar source, larval host plant, seed source for birds
Pollinators: bees, butterflies, moths
Uses: edible tubers, ornamental plant, wildlife food source

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 2/9
Soil reaction: 6/9
Light: 8/9
Temperature: 7/9
Moisture: 4/9
Nutrients: 6/9

Taxonomy resolved against GBIF.

Questions people ask

When is the best time to harvest sunchokes?: Tubers can be harvested in the fall after the foliage dies back, or left in the ground over winter and harvested in early spring.
How do I control their spread?: Plant them in containers, or in an area where their vigorous growth is desired. Digging up tubers in fall can help manage spread.
Can sunchokes be grown in containers?: Yes, but choose a large container (at least 15-20 gallons) to accommodate root growth and prevent escape.
Why are my sunchokes not flowering?: Flowering is dependent on day length; shorter days in late summer and fall trigger blooming. Ensure they have enough sun.
Are sunchokes related to potatoes?: No, sunchokes are part of the sunflower family (Asteraceae), while potatoes are in the nightshade family (Solanaceae).

Where the name comes from

The common name 'Jerusalem artichoke' is thought to be a corruption of the Italian 'girasole articiocco', meaning 'sunflower-artichoke', referring to its appearance and edible tuber. The scientific name 'Helianthus' comes from the Greek words 'helios' (sun) and 'anthos' (flower), while 'tuberosus' refers to its tuberous roots.

Good to know

The tubers are a good source of inulin, a prebiotic fiber.
Native Americans cultivated sunchokes for centuries.
They can grow quite tall, sometimes reaching 6 to 10 feet.
The flowers resemble small sunflowers.
They are remarkably drought-tolerant once established.

Is your jerusalem artichoke looking unwell?

This page is a general guide. Pocket Botanist diagnoses problems from a photo of your actual plant, works out watering for your light and conditions, and reminds you when care is due.

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This guide was generated with AI and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.