Growing
Celeriac takes patience, as you are growing the swollen, bulb-like hypocotyl rather than the stalks. Sow seeds into a well-draining medium once the soil has warmed. Aim for a soil pH between 6.0 and 7.0. Because this is a cool-season crop, it grows in damp, even conditions, so keep your garden bed or container consistently moist to support the development of the heavy root.
As the plant matures, maintain consistent moisture to prevent the bulb from becoming woody. Unlike many other vegetables, celeriac does not continue to ripen once you pull it from the ground, so harvest it when the bulb has reached its full size. When you are ready to harvest, lift the root from the earth. To keep your harvest fresh longer, store the roots unwashed in a cool, dark cellar or in the refrigerator. If you plan to freeze your harvest, blanch the celeriac first to preserve its quality.