Hong Kong is near the northern limit of the distribution of tropical South-East Asian flora, sharing similar species and structure with the flora of Guangdong Province. Despite its small size, Hong Kong has a rich flora with about 3 100 species of vascular plants. Various conservation measures have transformed the formerly bare hillsides and slopes into impressive woodlands. Besides greening and beautifying the countryside, woodlands are important habitats for wildlife and are essential for protecting water catchments from soil erosion. They also provide recreational opportunities for the public.

Remnants of the original forest cover, either scrub forest or well-developed woodlands, are still found in steep ravines. They have survived through their location in precipitous topography and the moist winter micro-climate.