Gerhard, sow the seed immediately in a moist medium and store it at about 5 degrees C; expect small bulbs to emerge from the seeds during the following three months. During that period, keep the temperature at about 5 degrees C. Higher temperatures will inhibit germination. After about three months, bring the germinated seeds into warmth and foliar growth will commence. Jim McKenney Montgomery County, Maryland, USA, USDA zone 7, where I noticed today that many Calochortus have foliage above ground.