Direct seeding. No pre-germinative treatment is required.
-In some cases it has been found useful to soak them in cold water for 15 days at a temperature of 2-6°C, changing the water daily to eliminate the germination inhibiting substances expelled by the seed itself, which delay germination. The seed is ready when it changes from its typical whitish color to an orange-brown color.
-Positive results have also been obtained by cold stratifying the seeds for 3-4 months (in some cases it has been necessary to stratify for 3 years) and then sowing them.
Early Summer, Late Summer
Early Autumn, Late Autumn