the ones that look like carrot tops remind me of a wildflower I have
growing along the side of my garden that blooms small pink
flowers. I don't know what they are called but I got them in a variety
seed pack labeled 'butterfly attracters'....or something like that? they don't seem aggressive. mine stay fairly small and to them selves and the
flowers are pretty. (I haven't seen any butterflies around them yet, though)