Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec
At its best:
Sep, Oct, Nov, Dec
Sow in spring into a seed tray filled with good-quality compost. Sprinkle the seed lightly in shallow drills, then lightly cover with compost.
Water gently, then place the tray in a heated propagator at 10-12°C. Ensure the compost remains moist; a layer of capillary matting beneath the seed tray can act as a reservoir.
Once the seedlings are large enough to handle easily, transplant each into its own pot of compost, firm and water well.
Celeriac grows well in heavy soils and is a good choice if you're looking for a crop that thrives in poor summers.
Plant out the plants in late spring, when they are 5-7cm tall. Space them 25-30cm apart in rows 30-45cm apart. Do not bury the crowns. Water well during dry periods or on lighter soils. To retain moisture it's worth applying a bulky, organic mulch straight after planting, making sure it is kept clear of the swelling roots.
Celeriac should be ready to harvest from late September onwards, but a more intense flavour develops if left in the ground longer. You may need to use a fork to gently lift out each root.