Jerusalem artichoke
Helianthus tuberosus
Also known asSunchoke · Sunroot · Earth apple · Topinambour
Environment
The bounded range this crop tolerates.
Climate and zones
- USDA zones
- 3–9 (winter low around -40°C)
- Frost
- very hardy (survives deep cold)
- Season
- cool (spring/fall)
Growing systems
Root mass: very heavy. Thin-channel systems can't hold this crop.
Growing media
| Medium | pH effect | Retention | Bacterial surface |
|---|---|---|---|
| Soil-based mix (Potting soil) | varies | high | high |
Nutrient demand by stage
NPK ratios are relative weights. EC targets shift through the plant's life.
| Stage | N | P | K | EC (mS/cm) |
|---|---|---|---|---|
| seedling | 2 | 1 | 1 | 1 |
| vegetative | 2 | 1 | 2 | 1.6 |
Companion-growing notes
- High transpiration. Regular reservoir top-ups needed during fruiting.
Aquaponics suitability
Not recommended
Fish waste alone doesn't supply enough of what this crop demands. Grows in hybrid systems with supplemental dosing, but expect active management.
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.