Stratify for 30-60 days. Sow in a container, cover with a plastic bag and refrigerate, or mix seed with damp clean sand or vermiculite, bag, and refrigerate at 35-40F. Check often for germination and maintain a lightly moist medium. Transplant any seedlings as they germinate. After the chill period, sow into soilless media and keep at 60-70F.
Direct sow 2-3 weeks before the last spring frost date, or wintersow into pots of well-drained media in the shade, covered with a thin layer of clean sand and a wire screen to keep out mice and voles. Check for water, keeping evenly moist.