The present invention relates to a composition and method for the treatment of seeds, which allow efficient decontamination of seeds from unwanted external nucleic acids, viruses, bacteria and microorganisms. A comparison of the medium length of the shoots from seeds after 6 days of germination shows the positive effect of the method according to the invention on seed germination and development. That is, treatment of seeds with the composition according to the invention surprisingly also results in enhancement of seedling development. The composition may be applied as a water-based solution or solid carrier or in combination with other seed treatment additives like nutrients, fungicides or pesticides. The composition according to the invention also allows coating of seeds.