PROBLEM TO BE SOLVED: To provide a seed coating method to improve the germination rate and the crop yield but also enhance the growth of the obtained plant, specifically the method to develop and increase its biomass, and a seed coating composition.SOLUTION: The present invention concerns a method to increase the growth of a plant for maturing, by coating a seed of the plant with a composition comprising a cationic guar having a degree of substitution between 0.005 and 3 and an average molecular weight of about 100,000 daltons and 3,500,000 daltons.SELECTED DRAWING: None