Black Earth Rettenmund Prairie is a Wisconsin Department of Natural Resources-designated State Natural Area featuring one of the few remaining dry-mesic prairies in Wisconsin, situated on a low Driftless Area knob and ridge. Despite the prairie's relatively small size, 130 native prairie plant species have been documented on the site. Many of these species are quite showy, including wood lily, shooting star, fringed puccoon, pasque flower, butterfly weed, and compass plant. Several rare species are also found on the site, including pomme-de-prairie, white camas, striped hairstreak, and the state-threatened species rough-stemmed false foxglove (Agalinis gattingeri) and regal fritillary.