Cucumbers want to stand quite warm, therefore sufficient cover material must be provided.
The cold frames are covered every night with straw blankets or similar. ä. Covering material to be provided, even if no night frosts are expected. This reduces the temperature fluctuations between day and night. Covering should be maintained through June. In the first period after planting or. after sowing, ventilate only at temperatures above 25°C. The cold frame windows must always be ventilated on the side facing away from the wind. With regard to the fertilization and irrigation of the box cucumber, the statements in the advice apply accordingly.