The idea that classical scalar fields could serve as dark matter on galactic and cosmic scales has been widely studied. In this talk we will discuss a numerical study of the nonlinear dynamical evolution of the shadow and gravitational lensing produced by the accretion of a scalar field onto a non-rotating black hole. We examine wave packets, characterized by their wave number and width, interacting with and being accreted by a dynamic black hole, increasing the apparent horizon and simultaneously the black hole shadow size.
