Artichoke
Cynara cardunculus var. scolymus
Also known asGlobe artichoke · French artichoke · Carciofo · Alcachofa
Environment
The bounded range this crop tolerates.
Climate and zones
- USDA zones
- 4–11 (winter low around -34°C)
- Frost
- frost hardy
- Season
- cool (spring/fall)
Growing systems
Root mass: 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 | 1.2 |
| vegetative | 3 | 1 | 2 | 1.8 |
| flowering | 2 | 1 | 2 | 2 |
| fruiting | 1 | 1 | 2 | 2 |
Companion-growing notes
- Heavy uptake of potassium, nitrogen. Co-grown crops with the same demand will end up deficient even at "correct" EC.
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
A demanding hydroponic crop given the plant size and perennial habit, but workable in large systems. Dutch bucket or big container setups, around 40 L per plant, with drip irrigation, suit it best. Hold EC around 1.4-2.2 mS/cm and pH near 6.0-7.0. It likes cool Mediterranean conditions, about 15–24°C, and heat over 30°C hurts bud quality. Give full sun, on the order of 18-25 mol/m2/day. Most types need vernalization, a cool spell around 5–10°C for two to four weeks, to trigger budding; without it many varieties make only leaves. Seeded annual types such as Imperial Star, Tavor or Colorado Star have been bred to bud in their first year without that cold treatment, giving a first cut roughly 90 to 120 days from transplant. Each plant sets about three to eight buds a season; pick them tight and compact, before the scales open. Feed heavily, with high nitrogen during leaf growth, then more potassium and phosphorus as buds form. Aphids on the bud scales are the usual pest. In aquaponics, artichokes in media beds beside the fish tanks add real visual presence.
Notable varieties
| Cultivar | Type | Origin | Days | Notes |
|---|---|---|---|---|
| Green Globe | heirloom | 365 | The standard California perennial variety, large round green buds. Productive in years 2-5. Zone 7+ overwintering. | |
| Imperial Star | open pollinated | University of California, 1990s | 90 | Annual variety, bred to flower in year 1 without vernalization. The variety to grow north of zone 7. Smaller buds than Green Globe but reliable from spring-planted seedlings. |
| Violetto | heirloom | 365 | Italian heirloom, purple-tinged elongated buds. Smaller than Green Globe but more cold-tolerant (zone 6 with mulch). Common Italian variety; the buds for fritti style frying. | |
| Tavor | open pollinated | 90 | Annual Israeli variety. Earlier than Imperial Star, slightly larger buds. Heat-tolerant for the species; works in Southern US. |