Unlike true ageratum (Ageratum houstonianum), it is a perennial and is hardy in zones 5 through 10. The reason blue mistflower makes such a good plant for keeping weeds from taking over ...

That's why planting blue mistflower as a ground cover is something you might want to try. Blue mistflower (Conoclinium coelestinum) is a member of the daisy family, and has showy purple or blue ...