Three field experiments were conducted at the Agronomy Field Laboratory, Bangladesh 'Agricultural University, Mymensingh to determine the suitable age of mother plant for stem cutting, the appropriate length of cutting, and the optimum date of planting, spacing and dose of TSP for seed production of Sesbania rostrata. These experiments were conducted during July to December each year of 2000 to 2002. Each of the experiments was set in a Randomized Complete Block design with four replications. Results indicated that for seed production of the crop through vegetative means, it might be raised with top portion planted on 20 July. Neither the age of mother plant, length of cutting and their interaction nor the plant spacing, dose of TSP and their interaction had any significant effect on the plant characters and seed yield of the crop.