ORGHPS Germination Guide: N Sow directly in the garden. Sow @ 20°C. Seed germinates within 3 months Resents transplanting. Requires scarification. Nick or rub between sheets of sandpaper. Requires soaking. Place in warm water until seeds swell, usually 24-48 hours. Discard water and any seeds that remain floating. * plant does not tolerate phosphate in fertilizer or soil

Source: Ontario Rock Garden & Hardy Plant Society