Sowing

The celeriac needs a long season and must be pre-cultivated. As the seed wants light to germinate, you should sow the seeds shallowly (2 mm) already in February-March, 10-12 weeks before planting as planned. Keep the soil moist with a temperature of 18-22° C during germination, which takes 14-24 days. To shorten the germination-time put the seeds in lukewarm water for 24 hours, dry them and sow.
Give the seedlings a lot of light and lower the temperature after a few weeks.  You will need to pot them on at least once because of the long time they spend developing. Temper them gradually without exposing them to too low temperatures. The risk of runners grows markedly if the temperature is below 13°C for a longish time. Temperature shocks can also cause flowering. Plant outside when the earth has warmed up and the risk of nightly frosts are over.

Spacing

Between the plants 25-35 cm and between the rows 50-60 cm.

Harvest

If one wants longer or tenderer stems or a longer time for harvest in the autumn, one can put up hay, straw or leaves as protection. Celery cannot stand a lot of frost and must be harvested, if not protected, before the cold comes. Celery keeps well for a few weeks in a cool, humid place. It is usually used fresh in salads or cooked in soups, casseroles, gratins etc.

Seed

About 2000 seeds/g yielding 1000 seedlings. One portion yields about 100 seedlings and contains about 200 seeds.