Abstract: Disclosed is a method for increasing the growth rate and concentration of in vitro cultivated plant cells by re-induction and stimulation of the growth of plant cells. The method comprises the steps of: a) growing plant cell cultures in a nutrient medium under growth conditions suitable for initiation of growth; and b) supplementing cell culture with additional macronutrients between initial growing stage and before culture death in an amount sufficient to re-induce growth without being toxic to the culture. The growth is re-induced, stimulated, maintained and increased to obtain increased plant cell concentration in culture.