Mendel also experimented with hawkweed ("Hieracium") and honeybees. The park contains grassland, with hawkweed, gorse and broom. Other common names are Orange Hawkweed, Fox and Cubs, Devil's paintbrush and Red devil. It does not compete well with pasture grasses or exotic weeds like hawkweed ("Pilosella" spp.). It is often seen in the company of mouse-ear hawkweed ("Hieracium pilosella"). Hieracium snowdoniense, the Snowdonia hawkweed, is a plant endemic to Snowdonia, North Wales. White campion, common toadflax and mouse-ear hawkweed are also supported. Hieracium murorum, the wall hawkweed, is a species of flowering plant in the sunflower family. Yellow hawkweed tends to invade open and undisturbed natural areas. Hieracium villosum, the shaggy hawkweed, is a species of flowering plant in the aster family. Picris hieracioides or hawkweed oxtongue is a species in the daisy family (Asteraceae). Prickly hawkweed ("Hieracium horridum") is hairy and grows in rocky places and crevices. The Snowdonia hawkweed, "Hieracium snowdoniense" is only known to occur in Cwm Idwal. A polycarpic perennial, Radyr hawkweed flowers from late May to early June or July.