ORGHPS Germination Guide: Sow @ 20°C. Seed germinates within 3 months Requires darkness. Requires soaking. Place in warm water until seeds swell, usually 24-48 hours. Discard water and any seeds that remain floating. * "add detergent to water when soaking, sow in equal parts of peat, loam and grit with extra richness at bottom of pot, space 2"" apart, allow absolutely no light during germination, provide steady supply of moisture, grow on in pot for 18 months"

Source: Ontario Rock Garden & Hardy Plant Society