The tree species predominant in Kolar are Acacia nilotica, Acacia auriculiformis, Albizia amara, Albizia lebbek, Azardirachta indica, Eucalyptus sp. , Mangifera indica, Pongamia pinnata, Prosopis juliflora, Tamarindus indica etc. The mainly used fuelwood trees are Acacia nilotica , Acacia auriculiformis, Eucalyptus sp. , and Prosopis juliflora. Due to scarcity of fuelwood in some parts of the district, a section of population meets its cooking and heating fuel through use of shrubs and weeds like Lantana camara and Cassia auriculata.

Kolar taluks has a woody biomass productivity of 3.6 t/ha/yr. (evergreen, semi - evergreen), 3.9 t/ha./yr. ( deciduous) and 0.9 t/ha/yr. (scanty and scrubby vegetation). The ratio of bioresources availability to demand ranges from 0.11 (Kolar) to 0.73 (Srinivaspura), fuelwood demand is taken as 1.3 kgs/person/ day (Ramachandra et al., 1999). The efficiency of conversion of the biomass to useful energy is between 5% to 15%.