Climate matters. This page is a practical baseline. Confirm cultivar, local frost/heat conditions, mature size and regional restrictions before planting.
Kohlrabi — Growing reference
| Scientific name | Brassica oleracea var. gongylodes |
|---|---|
| Seed germination (days) | 5–10 |
| Soil temperature for germination (°C) | 7.2–29.4 |
| First harvest or flowering (days) | 45–60 |
| Measured from | Seed |
| Plant spacing (cm) | 12.7–20.3 |
| Mature height (cm) | 30.5–45.7 |
| Mature spread (cm) | 15.2–25.4 |
| USDA hardiness zones | 3–10 |
| Light | Full sun |
| Water | Moderate |
| Sowing method | Direct sow |
Growing directions
Direct sow seed 1/4 in deep in cool, fertile soil and thin plants to 5–8 in to give the swollen stem room to develop. Keep soil consistently moist, as drought stress causes the bulb to become woody and strongly flavored. Harvest when the swollen stem is 2–3 in across for best tenderness; larger bulbs become fibrous. Pull the whole plant and trim the leaves before storing in the refrigerator.
Source and local conditions
Typical planning ranges from OpenPlantDB (CC0). Cultivar, climate, season and growing method can change these values. Confirm the seed label and local guidance before planting.
Source & verification
OpenPlantDB · CC0