The study was conducted to evaluate the growth response of Eucalyptus camaldulensis and Acacia nilotica in various sizes of polythene bags. The increase in plant height for E. camaldulensis was 16% in bag size of 20" x 30" as compared to control (without bags). For A. nilotica, the increase in plant height in bags size of 18" x 24" was about 59% that of the control (without bags). E. camaldulensis gained 82-88% and A. nilotica 75-89% of its height during May-August. The peak daily potential evapo-transpiration (ETo) of 9.41 mm/day was observed during June.