The invention relates to the saturation of different gaseous, liquid, gel-like, solid and mixed media with ingredients emitted by vegetative plants. The method for treating a medium by saturating it with useful substances emitted by plants involves supplying a gaseous medium to a chamber containing vegetative or cut plants and passing the gaseous medium saturated with plant excreta through the medium undergoing treatment. Furthermore, a low pressure or a low and a high pressure is generated in the above-mentioned gaseous medium in the chamber containing the vegetative or cut plants. The medium treating device comprises a means for pumping the gaseous medium, at least one chamber for plants emitting plant excreta, which chamber is connected by a pipe to the above-mentioned means on the intake side and to the pumping means on the discharge side; furthermore, the above-mentioned means is connected on the discharge side to at least one container for the medium undergoing treatment.