Days to Germination:10-28 days
Challenging to grow, yet if you have savored its tonic sweetness, you know it is worth the trouble! Raise as transplants 10 to 12 weeks before setting out. Start early in order to produce a large root before a heavy frost in the fall. Sow seed shallowly, germinate in strong light, providing warmth (preferably 65°-75°F) and good air circulation. To ensure good germination, keep soil moist and pamper until seedlings emerge. Gradually accustom plants to the outdoors and plant in the garden after danger of frost has passed or when temperatures are consistently above 55°F. Celeriac has a ravenous appetite, growing best in rich, loamy, well-fed soil. Amend with lots of compost, well-rotted manure and balanced organic fertilizer. Regular watering will provide the ample moisture Celeriac needs to grow. Use a spade to harvest the large bulb-like root when baseball size, before a heavy frost.
Big and Beautiful
In Europe, Celeriac growers remove the lowest shoots on the plant, and let the central, upright stems develop fully. This is said to produce larger roots and also smoother, rounder ones without extra, knobby, side roots.
Tips for Harvesting and Storing Root Vegetables