A hardy, high-quality cucumber for greenhouse cultivation that only sets female flowers. Generous with dark green, bitter-free cucumbers about 35 cm long. Resistant to powdery mildew. Good fresh on sandwiches and in salads. Cultivation: Sow indoors, one seed in each pot 1 cm deep, in seed soil during April-May. Groningen requires a very high temperature, 22-24 degrees in the soil. Then continue to grow at 17-18 degrees. About 5 weeks after sowing, the cucumber is planted out on a bed or in a large pot (15 liters) in a greenhouse. Cucumbers require even moisture in the growing bed. Plant the cucumber high so that the water runs away from the stem, the root collar is sensitive to moisture.