This European perennial invades pastures and lawns, displacing native plants and forming monocultures. The vibrant orange-red flowers are clustered at the top of the leafless stem and you’ll see them in late spring to mid-summer. Orange hawkweed (Hieracium aurantiacum) grows about 12′ tall and produce dandelion-like fuzzy seedheads. The plant spreads vegetatively through stolons. All parts of the plant also produce a milky juice. The best way to get rid of it is to dig it out by hand, making sure you get all the roots.