The Brechovo mire is a natural monument of the Ulyanovsk region, it is a stratigraphic standard of the Holocene period, the place where rare and medicinal plant species grow and has significant reserves of a valuable natural resource – peat. Currently, it is exposed to a number of anthropogenic factors, which causes concern for the safety of its natural complexes. The article is based on the description of trial plots (total 96 descriptions).