Over a third of the property is covered with indigenous virgin beech forest. Beech forests also form the boundaries to the west and east, attracting abundant and diverse bird life. Native bird life includes the distinctive song of the tui, bellbird (koimako), morepork (ruru), native wood pigeon (kereru), hawks, and falcons, as well as the rare blue duck (whio). Some species present on Poronui are rated as vulnerable or threatened, particularly the New Zealand ‘bush’ falcon. The only native land mammal species (the long- and short-tailed bat) are also present.

Additionally, Poronui is characterized by numerous wetland and scrubland ecosystems, comprising of mostly native plant species. The Taharua River runs through the center of the property, and the famous Mohaka River forms the southern boundary. These rivers were granted status among New Zealand’s most important water bodies by being given the full protection of a National Water Conservation Order. This protection was granted on the basis of spectacular scenery, amenity water sports, and outstanding trout fishery.

As the exotic trees planted on Poronui in the late ’80s and early ’90s reach maturity, these are being replaced primarily by mānuka and open grassland.

Farming on Poronui is designed for low-impact on the environment. The farm runs an Angus breeding herd, a commercial venison herd, and an expansive beekeeping operation primarily for mānuka honey.