GHNP’s temperate belt is largely dominated by trees.
Conifers, including the blue pine, cedar, spruce and fir, are widely distributed in the low- to high- altitude zones. The upper coniferous areas are shared with oaks, which provide acorns for birds and rodents. The banjh oak can be found alongside the chir and blue pine, whilst the moru oak grows beside fir and spruce. The kharsu oak is generally found in pure forest at the tree line. A number of lichens and fungi grow on the oak trees, providing food for mammals and birds.
The Himalayan yew is the most abundant tree in the fir forest, which provides a distinctly cool microclimate.
Rhododendron trees predominate between 1,500 and 3,000m, and tend to favour lower elevations on the north side. Four species of maple grow between 1,500m and 3,500m, whilst horse chestnut, alder, poplar, birch and willow are common near to streams.