Hi, both,
I like the flowers too, they have a quiet, quirky charm to them, though I find the plant itself only does well with fairly regular watering. Regarding use by butterflies, it is a specific food and habitat plant of the Monarch butterfly and I don't know whether others regularly use it or not. So if you are in an area not visited by Monarchs, perhaps it would remain butterfly-free...? I will be watching ours more closely to see if any other species are using them.