Hawkweed is a pest of turf areas. The flower resembles dandelion. One species, Hieracium pilosella, is rhizomatous and grows in circular patchs with flower stems about six inches high. Hawkweeds are an indicator of infertile soil and are not usually a problem in well managed turf. Since they resemble dandelion and are resistant to 2,4-D, we often hear of dandelions being resistant to 2,4-D. Other plants similar in appearance such as hawksbeard (Crepis spp.)and spotted catsear (Hypocharis radicata) are also resistant to 2,4-D.