Rushes and purple moor-grass are often the main dominant species, along with a variety of sedges, herbs, and grasses, which provide habitat for a range of native animals, including invertebrates.
Brwyn a glaswellt y gweunydd yw'r prif rywogaethau yn aml, ynghyd ag amrywiaeth o hesg, perlysiau a glaswellt, sy'n darparu cynefin i amrywiaeth o anifeiliaid brodorol, gan gynnwys infertebratau.