Brussels sprouts
Brassica oleracea var. gemmifera
Also known asBrussel sprouts · Choux de Bruxelles · Rosenkohl
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: 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 |
| Coco coir (Coconut coir) | slightly acidic | high | moderate |
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 | 2.2 |
Companion-growing notes
- Heavy uptake of nitrogen, potassium. Co-grown crops with the same demand will end up deficient even at "correct" EC.
Aquaponics suitability
Compatible
Fish waste provides enough nitrogen for healthy growth. Supplemental potassium, calcium, and iron may still be needed depending on fish stocking density.
Care notes
A challenging hydroponic crop due to the long growing season (90-120 days from transplant), large plant size, and strong preference for cold weather. Large containers (20 L) or media beds with depth for the substantial root system. EC 2.0-3.0 mS/cm. pH 6.0-7.0. Temperature: 10–20°C for best flavor and tight sprout development (above 24°C, sprouts become loose and bitter). Moderate to high light (DLI 15-22 mol/m2/day). The tall stalk needs staking to prevent toppling. Remove lower leaves as sprouts develop to improve light and air circulation around the sprouts. To encourage uniform maturity, some growers 'top' the plant (remove the growing tip) 3-4 weeks before planned harvest, which redirects energy to sprout development. Harvest individual sprouts from the bottom up when they reach 2–3 cm diameter and are firm. Frost exposure improves flavor; if growing indoors, a brief cold treatment (5°C for a few days before harvest) helps. Brussels sprouts are best suited to late fall and winter hydroponic or aquaponic production in unheated or minimally heated greenhouses.