Jerusalem artichoke

Quick facts

Category

roots bulbs

Difficulty

beginner

Days to harvest

100 to 150 days

Harvest type

single harvest then replant

Spacing

60 cm between plants

Environment

Temperature

7–30°C

pH

5.5 to 7.5

EC (hydroponic)

1.4 to 2 mS/cm

Daily light

18 to 28 mol/m²/day

Climate and zones

USDA zones

3 to 9 (winter low around -40°C or warmer)

Frost tolerance

very hardy (survives deep cold)

Season

cool (spring and fall crops)

Viable growing environments:

• outdoor year-round (in zone)
• outdoor in growing season (annual)

USDA zone bounds reflect outdoor year-round survival. Anywhere outside the bounded zone range, this crop still grows as an annual in the warm months (outdoor_seasonal), under cover (greenhouse), or indoors under lights.

Growing systems

Jerusalem artichoke works in:

• soil bed
• media bed (ebb and flow)

Root mass is very heavy - thin-channel systems (NFT, vertical towers) can't hold this crop mechanically, hence the system list above.

Growing media

The substrate the roots sit in. Choice depends on the system (clay pebbles don't fit NFT channels; rockwool isn't used in media beds) and the crop (jerusalem artichoke works in the media listed below).

Bacterial surface area matters for aquaponics: clay pebbles, lava rock, and pumice double as biofilter substrate. Low-surface media (rockwool, perlite, pea gravel) work in hydroponics but need a separate biofilter in aquaponics.

Nutrient demand by stage

NPK ratios are relative weights at each growth stage; the nutrient mix calculator scales them to absolute grams or ml. EC targets shift through the plant's life: seedlings need a much lighter solution than fruiting adults.

Companion-growing notes

• High transpiration. Reservoir level will need regular top-ups during fruiting or flowering.

Aquaponics suitability

Not recommended for pure aquaponics. Fish waste alone doesn't provide enough of the nutrients this crop demands (typically potassium, calcium, or boron). It can be grown in a hybrid system where the reservoir is supplemented with hydroponic-style nutrients, but expect to dose actively.

Care notes

An extremely productive root crop for outdoor aquaponics media beds. Each plant produces 1–3 kg of tubers from a single planted tuber. EC 1.5-2.5 mS/cm. pH 6.0-7.5. Temperature: cold-hardy perennial (USDA zones 3-9); grows actively at 15–28°C. Full sun (DLI 16-25 mol/m2/day). Plant tubers or tuber pieces 10–15 cm deep in spring. The tall stems need staking in exposed locations. Harvest tubers in late autumn after the plants die back, or throughout winter (the tubers store best left in the ground). Warning: sunchokes are invasive. Every tuber fragment left behind sprouts. In a contained media bed, they're manageable; in open ground, they become permanent. The tubers don't store well after harvest (they shrivel within 1-2 weeks); keep them in damp sand at 1–4°C or harvest as needed from the ground. Preparation: raw (thinly sliced in salads, or as crudites with dip), roasted (cut into chunks, toss with olive oil, roast at 200°C until caramelized), or pureed into a velvety soup. The sweetness intensifies after frost exposure.

Further reading

• Best crops for hydroponic beginners
• The Kratky method: grow lettuce with zero electricity