The mountains of Bhutan are thickly covered with evergreen forests untouched since time immemorial. In the north, the snowy Himalayan peaks form a natural boarder with Tibet. A few rivers pour down from the central highlands to the valleys through narrow gorges.
Bhutan is blessed with abundant precipitation throughout the warm season, therefore, her plant kingdom is highly developed, and plants are fully matured in every altitudinal zone. The tropical forests spread through the lower Himalayan region, and the mid mountain area is covered with temperate evergreen forests. Central Bhutan is the main cultivation zone. The coniferous forest zone lies in the higher parts of the country. The beautiful alpine grassland creeps up to the glaciers along the northern boarder.
The richness of flora makes Bhutan one of the most attractive places to admire the beauties of nature. In early spring, white magnolias and rhododendrons of several hues, in the mid-mountain zone go into full bloom, then primulas and many other spring flowers follow suite. By the rainy season, blue poppies and others constitute the rare beauties. Epiphytic orchids begin to bloom with the rainy season. At the end of the rains, the alpine meadows abruptly turns from green to brown, and only a few flowers like gentians and edelweiss remain and snow will soon cover them.
The narrow southern belt of Bhutan consists of tropical forests including giant bamboos, many different kinds of palm and rattan. The mid mountain area of Bhutan, alt ranging from about 1000 to 2500 metres is the zone of temperate, evergreen and broadleaved forests. The upper half of this zone is largely inhabited and cultivated. The alpine meadows of Bhutan Himalayan stretch wide and gently spread over the old glaciated valleys and hillsides. In the summer rainy season the meadows spring to life with flowers, a fusion colours of red, white, purple, blue and yellow.