Silver nanoparticles synthesis of varying sizes using Techoma stains flower extract at room temperature. The synthesized silver nanoparticles are characterized by using UV-visible spectrophotometer and Transmission electron microscope (TEM). The effect of the time on the particle size has been reported. Synthesis of flower extract mediated silver nanoparticle is very cost effective and eco friendly and therefore can be economic and effective alternative for the large scale synthesis of silver nanoparticles.