I got these seeds from the Wild Seed project - Maine Native Seeds, a great non-profit dedicated to the preservation on indigenous plants and shrubs in North America and Turtle Island. I love how regal and healthy these plants. They are really easy to maintain once you have them in the ground. It just takes a bit of time and patience to stratify, germinate and acclimatize the plant.
It is recommended to consult a certified therapeutic herbalist or another qualified healthcare professional before use.