The major research scope was to study the effect of various forms of potassic fertilizers and the ratio of N, P2O5 and K2O. During the experimental period, quantitative measurements of growth vigor and flowering were taken. At the end of experiments, the optimal levels and sources for those high-priced flower crops would be formulated for future production. A new formulation 12-5-17-2 (MgO) of compound fertilizer was manufactured sod showed positive effect on increasing yield and improving quality of both chrysanthemum and gladiolus. Two new products with formulations 5-5-5-2 (MgO)-10(Humic acid) and 16-8-12-3(MgO) were both able to increase the yield of leather fern.