That Heye is one of the few areas in Oceana where flowering plants are common, apart from the Emerald Highlands and along the Beaver River. Due to fertilizing, grasses have become more common, but originally the area was covered almost exclusively by plants of the Heyalus genus, plants strongly resembling the Calluna species, or heather, that is common in Europe, but not related. This genus includes over fifty different species, making That Heye the most diverse natural environment of Oceana when it comes to biodiversity, together with Svolnick Moor. Another native plant that is common in the region is the common dandelion (Taraxacum officinale), although it has been suggested that this plant was accidently introduced by early settlers in the region. A type of heath that was introduced by