Has anyone heard of putting the seeds in paper towel or a thin layer of water and freezing/ thawing out occasionally for stratification? Someone(you likely know who you are and this is an invitation to discuss this method) mentioned them when sending some S. purpurea seeds with locality data over to me. Since things are starting to warm up here I've popped them in the fridge with peat and sand(will take a photo and see what you guys think).