The Lubsza nature reserve was established by a regulation of the Minister of Forestry and Timber Industry of 24 December 1957 (MP No. 5). It is situated on the Ole?nica Plain and covers an area of 15.58 ha. The objective was to preserve its Galio odorati-Fagenion and Tilio cordatae-Carpinetum betuli communities. Some of the beeches and oaks occurring there are 400 years old and 2 metres in breast height diameter. In addition, around 90 species of tracheophytes, 36 species of the Musci class and 15 species of liverworts have been identified in the reserve.