I found this government of Ontario
webpage and thought it was a possible good source for seeds for a
permaculture system. They have seeds of
black locust (Robinia pseudoacacia), white oak (Quercus alba), black walnut (Juglans nigra),
Honey locust (Gleditsia triacanthos), elderberry (Sambucus canadensis, Sambucus pubens), juneberry (Amelanchier spp.), dogwood (cornus spp.), hazelnut (Corylus americana), and many other
trees.