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 challenging hydroponic crop due to plant size and the perennial lifecycle, but feasible in large systems. Dutch bucket or large container systems (40 L per plant) with drip irrigation work best. EC 1.5-2.5 mS/cm. pH 6.0-7.0. Temperature: 15–24°C (prefers cool Mediterranean conditions; heat above 30°C reduces bud quality). Full sun (DLI 18-25 mol/m2/day). Artichokes need vernalization (a period of cool temperatures, 5–10°C for 2-4 weeks) to initiate bud formation. Without this cold treatment, many varieties produce only leaves. Some annual varieties ('Imperial Star', 'Colorado Star') have been bred to produce buds without vernalization. From transplant, expect first harvest in 90-120 days for annual types. Each plant produces 3-8 buds per season. Harvest buds when they're tight and compact, before the scales begin to open. The plants are heavy feeders; high nitrogen during vegetative growth, then increased potassium and phosphorus when buds form. Aphids on bud scales are the most common pest. For aquaponics growers, artichokes grown in media beds alongside the fish tanks add dramatic visual interest to the system.
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. |