I'm sorry I can't help with that. Maybe you could ask Ian Christie or someone in Scotland where it grows so well. Having said that, once you have a plant or two, the best seed is from your own and even sown right away, in my experience it takes 8 months to germinate. Almost 8 months to the day, at the beginning of spring, so don't assume it's like say grandis and many others and will be up in 2 or 3 weeks. Good luck with finding a source.