Cold moist stratification is beneficial. To stratify, place seed between sheets of damp paper towel, roll up, place in plastic bag and place in fridge for 60 days or so. Remove from fridge and direct sow outdoors or sow indoors 4-6 weeks before last anticipated frost. Ideal temperature for germination is 20 ˚C. Seed can take up to 8 weeks to germinate. Hardy zones 2-10