Plants
The soils here contain coal deposits, are thin, poorly drained, infertile and highly acidic. This, combined with cold temperatures, high rainfall, high winds, and low sunshine hours makes for challenging conditions.
The plants that have adapted to this harsh environment are slow growing and fragile, adding to the uniqueness of the Denniston Plateau.
A combination of low podocarp-beech forest, manuka and Dracophyllum scrub, tussock grassland and pakihi/wetland areas provide for a wide variety of plants and animals.
Stunted shrubs such as manuka grow around the North Western snow tussock (Chionochloa juncea). This species is most common on the Denniston Plateau, and has formed a unique community with other hardy plants here.
The pygmy pine or mountain rimu (Lepidothamnus laxifolius) is believed to be the smallest conifer in the world. Usually found in high alpine areas, it is common at Denniston. It often forms a hybrid with yellow silver pine (Lepidothamnus intermedius), resulting in a low growing sprawling shrub.
Small red sundews are a feature of the wetland areas, their sticky droplets enticing tiny insects. 'At Risk' species such as Dracophyllum densum, and the eyebright (Euphrasia wettsteiniana) have all found their niche on Denniston Plateau and formed localised strongholds.
Animals

Powelliphanta patrickensis.
The plateau is home to the nationally endangered species of carnivorous land snail Powelliphanta patrickensis. A population of the even more endangered snail Powelliphanta augusta was moved from the Stockton Plateau to Mt Rochford in 2007.
Insects found on the plateau are similar to those normally found at higher altitudes. Many are large-bodied species.
Other significant native species include the great-spotted kiwi (roroa), that can be heard calling at night.
During the daytime you may be able to see:
West Coast green gecko, forest gecko and speckled skink are normally out of sight but roam around the area.
Conservation
Predator numbers are low on the plateau and this is potentially why species such as the large-bodied invertebrates have survived there.
DOC carries out predator control operations when predator levels or seed levels are high (mast events) enough. These levels are determined through various methods of monitoring.
Human activity around the plateau has introduced weeds – mainly gorse, broom and the rush Juncus squarrosus. These are controlled annually.