|Average Seed / oz||Seed / 100′ Row||Average Yield / 100′ Row||Days to Harvest|
|75000||1/2 gr||100 heads||115|
|Planting Season||Ideal Soil Temp||Sun||Frost Tolerance|
|Spring/Summer||50-70°F||Full Sun||Moderately Tolerant|
|Sowing Method||Seed Depth||Direct Seed Spacing||Seeds Per Packet|
|Mature Spacing||Days to Sprout||Production Cycle||Seed Viability|
Celeriac requires full sun and prefers moist, well-drained soil with adequate nitrogen. Prior to planting, work in 1 inch of compost. During the growing season, side dress plants with an organic nitrogen fertilizer such as manure, fish emulsion, blood meal, etc.
Start seeds indoors 10-12 weeks before the last frost date. Celeriac seeds require light to germinate. Sow seeds on top of the soil and press lightly to settle. Sow extra seeds to account for the fact that germination is typically low (50%). Seeds will sprout in 10-20 days. Thin seedlings so that mature plants are 8-14" apart. Begin to harden off celeriac plants once they have at least five leaves. Transplant outdoors when average nighttime temperatures are 55˚F or higher. Temperatures below this will cause celeriac seedlings to bolt.
Mulch or mound soil over bulbous stems to keep them covered. As the plants mature, remove the outer leaves as they droop and remove side shoots if they appear.
Celeriac roots are ready to harvest in approximately 115 days.
Celeriac is a biennial, meaning it flowers, sets seed and dies during its second year of growth. Allow some plants to overwinter in your garden. Celeriac is more frost hardy than celery, but may need covering in colder regions. Plants will flower the following spring. Flower umbels mature at different times, so collect seeds as they dry on the plant. Store seeds in a cool, dry place. Seeds will remain viable for 4-5 years.