Start indoors 10–12 weeks before last frost in 4” deep undivided flats or cold frame, plant out 1 week after frost in well tilled friable or sandy soil. For fall harvest, transplant 18 weeks before first frost. Reduce water for 7–10 days to harden off for transplant. Direct sow when soil is above 60˚F. Remove fine and lateral roots, and soil attached to crown for better development. Ensure adequate soil potassium, calcium and water to prevent black heart. Rotate crops to prevent leaf blight. Plant in protected beds to prevent rodent browsing. When working with celeriac on hot sunny days, wear long sleeves and pants, wash exposed skin after contact. Surface sow, press into soil, do not cover. Soil pH 6.1–7.5. Hardiness zones 6. Biennial.
Days from maturity calculated from the date of seeding. Federal germination standard: 55%. Average 63,500 seeds per ounce. Usual seed life: 4–5 years. Isolation distance for seed saving: 3 miles.
Planting Depth surface
Soil Temp. Germ. 70–75˚F
Days to Germ. 14–21
Plant Spacing 9–12in
Row Spacing 24–36”
Days To Maturity 120–160Full Sun
, Moist Well Drained Soil