Effect of atonik and gandasil D on the growth and yield of peppermintExperimrnt were conducted in green houseResearch Institute for Spice and Medicinal Crops at Bogor from February to April 1988, to know effect of atonik and gandasil D on the growth and yield of peppermint. Randomize block design in factorial order 2 factor and 3 replicates was used. The first factor is atonik concentration with 3 level, without atonik (A0), atonik 0.5 ml/l (A1) and atonik 1.0 ml/l (A2), while the second factor is gandasil D concentration i.e. without gandasi D (G0), gandasil D 2 gram/l (G1) and gandasil D 3 mg/l (G2). The experiment result showed that using atonik and gandasil D significant affected on the number of branches compared control but not on length of main shoot. The higher dry weight of herbs was reached by gandasil D 3 g/l.