Batavian lettuce
Lactuca sativa var. capitata (Batavian group)
Also known asSummer crisp lettuce · Batavia · French crisp · Crisp lettuce
Environment
The bounded range this crop tolerates.
Climate and zones
- USDA zones
- 4–10 (winter low around -34°C)
- Frost
- tolerates light frost
- Season
- cool (spring/fall)
Growing systems
Root mass: light.
Growing media
| Medium | pH effect | Retention | Bacterial surface |
|---|---|---|---|
| Rockwool (Mineral wool) | alkaline until pre-soaked | very high | low |
| Expanded clay pebbles (LECA) | neutral / inert | low | high |
| Coco coir (Coconut coir) | slightly acidic | high | moderate |
| Net pot, no medium (Bare-root) | - | - | - |
| 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 | 1 | 1 | 1 | 0.6 |
| vegetative | 3 | 1 | 2 | 1.2 |
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
An excellent hydroponic lettuce type that combines the texture of crisphead with the ease and speed of loose-leaf varieties. EC 0.8-1.5 mS/cm (lettuce is a light feeder). pH 5.5-6.5. Temperature: 15–22°C ideal (tolerates 24–26°C better than crisphead or butterhead types before bolting). Moderate light (DLI 12-17 mol/m2/day). Harvestable in 5-7 weeks from transplant (or 3-4 weeks as baby leaf). Works in NFT, DWC, raft, and vertical tower systems. The thicker leaves have a satisfying crunch that lettuce-leaf varieties lack, making Batavian types popular with consumers who want texture in their salad. Outer leaves can be harvested progressively (cut-and-come-again) while the center continues producing, extending each plant's productive window. Tipburn (calcium deficiency at leaf margins) is less common than in butterhead types because the open head structure allows better airflow to inner leaves. Red-tinged varieties ('Lollo Rossa', 'Magenta') add color to salad mixes and command premium prices. Succession plant every 2-3 weeks for continuous harvest. A top-tier hydroponic lettuce for both home and commercial growers.
Notable varieties
| Cultivar | Type | Days | Notes |
|---|---|---|---|
| Nevada | open pollinated | 55 | The benchmark heat-tolerant Batavian. Green ruffled heads with thick crisp ribs, holds without bolting through summer in zones 6 and below. The variety US market growers reach for when butterhead season ends in June. |
| Sierra | open pollinated | 55 | Sister variety to Nevada with red-tinged leaf margins. Same heat tolerance, slightly milder flavor. Striking in mixed-color salad pickings. |
| Cardinale | open pollinated | 55 | Deep red-bronze Batavian, classic French market type. Color intensifies in cool weather and softens in heat. Slightly less bolt-resistant than Nevada but a better-looking head. |
| Concept | hybrid | 50 | Modern F1 with stronger tipburn resistance than the open-pollinated Batavias. Light green tightly-folded heads, more uniform across a planting block. Common in commercial CSA mixes. |
| Magenta | hybrid | 55 | Red Batavian F1 with rosette form and a denser interior than Cardinale. Holds color better in heat and is more bolt-resistant. Useful where you want a red lettuce that won't quit in July. |