A method and associated system of treating a plant material consisting essentially of the plant cannabis in order to extract cannabinoids in liquid form from the plant material. The method includes heating the plant material； drying the plant material； grinding the dried plant material into a powder form； marinating the dried plant powder in a solvent for a predetermined time period to form a marinated mixture； shaking and heating the marinated mixture； filtering the mixture so that only a liquid part of the mixture remains； and evaporating from the liquid the solvent in order to provide the cannabinoid liquid extract.
