The garden was established in 1985 by the World Wide Fund for Nature; it opened to the public in 1991. It currently contains about 400 species indigenous to the Monti Ernici, a chain of central Apennine Mountains. This represents about 50% of the Monti Ernici flora, including some protected species. The garden contains a nature trail through forests, meadows, marshes and small clearings. Some plants are marked with a card providing botanical information.