One of the more successful plants in our garden are the white Martagon lilies we bought many years ago. They appreciate light shade and do well as a woodland plant. They will self-seed when happy with the conditions. Not a native, but they hold their place in our garden because they do draw bees and flies occasionally, and they look elegant and natural, unlike many of the cultivated lilies with large blooms.
(Photos from July 2014, Edmonton, Alberta)