Suitable for cultivation with and without casing soil. Produces uniform, firm bushes. Sow on well worked soil. Thin out upon emergence. Harvest roots in mid August. Allow the roots to die off for a few days on the soil. Cut the foliage of the root 2 cm above the head. As of late September to December stand the roots in a box or bucket. Keep in complete darkness, otherwise they become green. Forcing duration at approx. 16ºC is 4 to 5 weeks.