Climate matters. This page is a practical baseline. Confirm cultivar, local frost/heat conditions, mature size and regional restrictions before planting.
Celeriac — Growing reference
| Scientific name | Apium graveolens var. rapaceum |
|---|---|
| Seed germination (days) | 10–21 |
| Soil temperature for germination (°C) | 15.6–21.1 |
| First harvest or flowering (days) | 100–120 |
| Measured from | Transplant |
| Plant spacing (cm) | 30.5–35.6 |
| Mature height (cm) | 45.7–61 |
| Mature spread (cm) | 30.5–40.6 |
| USDA hardiness zones | 3–9 |
| Light | Full sun |
| Water | High |
| Sowing method | indoor-start |
Growing directions
Sow seeds on the surface of moist starting mix — they need light to germinate — and barely cover with vermiculite; seedling growth is extremely slow for the first 6 weeks. Transplant into rich, consistently moist soil and remove the lower side shoots throughout summer to encourage bulb development. Celeriac bulbs are at their best after light autumn frosts, which deepen the nutty flavor. Harvest before the ground freezes hard; trim roots and leaves and store in slightly moist sand in a cold root cellar.
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