The main characteristics of the laser applications in biostimulation, diagnostics and processing of medicinal and aromatic plants are presented in the paper. The lasers have been used for longer time in biology, due to stimulating effects of their radiation on plants' growth. The selected wavelengths have been utilised in different laser operating regimes as extension of previous experiments with natural noncoherernt light, but the effects that are being observed are much stronger. Diagnostic laser applications can be classified as automatic and numerical methods designed for the shape recognition, and physical methods based on static and dynamic light scattering, radiation reflection and absorption, linear and nonlinear laser spectroscopy etc. Due to the development of the lasers with wavelengths adjustable to resonant effects on bonding energies in molecular world and susceptibility of plants' photons, there are numerous approaches in laser applications including complete visible, ultraviolet and infrared light spectrum as well as X and gamma rays e.g. in order to induce sterilisation effects or longer conservation of specific plant performances, to perform remote content control of the plant or the surrounding air, microbiology analysis, etc.