Undergrowth is one of the components of forest ecosystems. It is also an important notion of the Act on Forests. The object of this study is the analysis of legal regulations concerning undergrowth, its protection and extracting its products. The deliberations include the issue of undergrowth in the context of: (1) principles of forest management (the principle of continuity and sustainable use of all forest functions, the principle of the persistent maintenance of forests) as well as (2) the principles under which forests are to be made accessible (extracting the products of undergrowth for industrial purposes and own needs of people). The fundamental aim of this article is to review selected regulations (of the A ct on Forests, the Code of Petty Offences) paying special attention to ensure the protection and sustainability of use of undergrowth and its products. In this context, de lege ferenda conclusions were reached, which – according to the author of the text – are supposed to contribute to more efficient protection of undergrowth and sustainable as well as rational extraction of its products.