Abstract: The effect of newly developed fertilizer named Fertilizer fritz (composed of Fe, Cu, Mn, Zn and B) on the growth responses, yield and uptake of micronutrients in the three medicinal plants Coriandrum sativum (Coriander), Nigella sativa (Kalonji) and Ptychotis ajowan (ajwain desi) were studied. Experiments were conducted in the fields of PCSIR Laboratories Complex, Karachi during October 1999 to May 2000 in randomized complete block design with three replications. The analysis of the data revealed that the formulation had a significant effect on plant height, length of leaves, yields of total plant, seeds, roots and stem. Maximum plant height was recorded in C. sativum (80%). Increases in the yield of plant material were about 45-95% in C. sativum, 25-60% in N. sativa and 5-40% in P. ajowan. Increases in the oil contents were 11.0, 8.80 and 7.60% for C. sativum, N. sativa and P. ajowan, respectively over control. In general plant responses towards the new formulation were in the order C. sativum>N. sativa>P. ajowan.