To preserve fresh plants Labofarm dries them. Drying eliminates water from plant cells and makes it possible to stop the degradation of active substances that are subject to uncontrolled enzyme reactions. We dry plants directly after being harvested as it prevents the growth of microorganisms that influence decomposition processes and that may constitute a potential hazard to patients’ health. While selecting drying parameters we consider different factors that may influence the quality of the plant. These factors include the chemical structure of a plant, the distribution of the active substance in a plant, drying temperature, oxygen influence, grinding plant before drying etc. Given that the parameters of drying may be subject to natural factors such as the structure of the active substance, the most important parameter is always the temperature of drying.