More than 90% of Australia's dry rainforests have been destroyed. Brogo protects patches of the most southerly extent of what remains in NSW.
The higher slopes and gully heads of the reserve are forested with Wet Vine Forest dominated by Forest Red Gum along with Coast Grey Box and Blue Box. Vines and twiners are common. The understorey is open and shrubby and there's a species-rich ground cover of herbs and grasses.
Pockets of Dry Rainforest around rocky outcrops are dominated by Port Jackson figs along with Kurrajong, and Native Quince.
Two patches of Warm Temperate Rainforest occur on lower slopes. Here Lillypilly and Sassafras, Tree Violet Bolwarra, Yellow Wood and many ferns are present.
Animals in the forests include Sooty Owl, Powerful Owl, Grey-headed Flying-fox, the Eastern Yellow Robin and the Long-nosed Bandicoot.