Apparently picking the bloom of a trillium damages the plant and it takes years for it to recover. For that reason, it is illegal to pick Trillium on public land. I think that kind of protection is wonderful and can only help to protect native species. Besides, it looks so natural among the leaves in the woods, I don't think it would ever look appropriate in a bouquet.
A local winery here in northern Michigan, named one of their wines Trillium. The bottle has a watercolor of a trillium blossom on it and it is the perfect casual wine for a picnic.
