The experiment to find out the response of Dendrobium 'Malaysian Green' flower to application of several GA3 concentrations. The experiment was conducted from January to April 2015 in Cibiru District, Bandung City with an altitude 740 metre above the sea level. The experimental designwas used the Randomized Block Design with descriptive analysis which consist six treatments. These treatments were :without GA3, GA3 75 ppm, GA3 100 ppm, GA3 125 ppm, GA3 150 ppm, and GA3 175 ppm. The GA3 application performed three times at intervals of seven days with spraying dosage 23 ml for each plant. The application of GA3 125 ppm, gave a longer flower stalk, higher flower number, and bigger flower diameter than without GA3.