This is Ammi visnaga Green Mist, also known as False Queen Annes Lace, and Toothpick Weed. This annual plant can live in full sun or partial shade where it grows about 3 feet high at most and blooms from the middle of the summer until early Fall. Some people like to chew the leaves and claim that they have a very nice flavor. This nectar rich flower is a big bonus for any beneficial pollinators.