The natural vegetation, generally, grows well where there is enough rainfall. It is conserved where the land is not fit for cultivation. The natural vegetation of India changes from one region to another due to the variations in the climate and soils. On the basis of climate and relief the natural vegetation of India can be divided in the following types:

1. The tropical evergreen forests,

2. The tropical deciduous forests

3. The tropical thorn forests,

4. The littoral or tidal forests, and

5. The mountain forests.

. Tropical Evergreen Forests:

These forests are found mainly in those areas where the annual rainfall is more than 200 cm, with a short dry season. The average annual temperature should range between 25 °C and 27 °C. The relative humidity should be around 70 per cent. The general climatic conditions should be hot and humid.

The trees in these regions are evergreen and do not shed their leaves. These forests are very dense and composed of tall trees reaching upto the height of about 60 metres. The trees have a multi-storeyed structure with good canopy. They look like a green carpet when viewed from above.

Due to dense growth of trees, the sunlight cannot reach the ground. Thus, the undergrowth mainly consists of canes, bamboos, ferns, climbers, etc. This makes the passage difficult through the forests. In some areas the evergreen trees are found mixed with deciduous trees. These forests are less dense and can be easily exploited.

The timber from the tropical evergreen and semi- evergreen a forest is hard, durable, fine-grained and of high economic value. The important trees of these forests are rosewood, ebony, mahogany, rubber, cinchona, bamboo, coconut, palms, canes, lianas, etc. The main species in the semi-evergreen forests are cedar, hollock, kail, etc.