I sent your message via regular email to a person I know that has been purchasing some from a nursery in Richmond. Go early in the morning and drive around. If you can ID it, then that is the first step. Wherever you collect it, do it safely. I take a bucket of water with me. It wilts very fast. Or, locate it in the morning and cut in the evening. Don't break the law. Don't collect from some one's property without getting permission.
Herndon, VA (USA)
Take care of the small things....