The nature reserve was established to protect the deciduous forests growing on the steep slopes at the Postomia river. The tree stand is a multi-storey one, with beech and black alder trees aged around 200 years. There are also multiple monument trees, such as oaks (with up to 6 m in circumference), beeches and field elms. The reserve can be conveniently accessed by car from Lemierzyce, and has a nature discovery path arranged by the Forest Inspectorate of Ośno.