Thin the seedlings to allow the roots to develop, and harvest selecting the plants that give the remaining crop root room
Can be left into the autumn and harvested as required.
Sow direct and thinly then pull up excess plants to the correct distance apart to allow root development
Try to aim for a seed spacing of at least 0.98 inches (2.5 cm) and sow at a depth of around 0.47 inches (1.2 cm). Soil temperature should be kept higher than 13°C / 55°F to ensure good germination.Sow direct, as the roots do not transplant well
As Weiner Runder Kohlschwarzer is tender, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.Roots can be left in the ground and harvested as required, as long as the weather is not too warm as they will tend to run to seed.
Harvest when the root has reached a good size but before it turns woody