The effect of foliar application of potassium on the growth pattern and yield components of three cultivars of pigeonpea (Cajanus cajan (L.) Millsp.), were studied. Potassium increased plant height and dry matter accumulation in all the three cultivars. Days to maturity was not much effected. Potassium increased yield in all the cultivars but at different levels. Flower drop was reduced conspicuously. However among the cultivars studied, cv.PDM1 showed better response than the others.