Ozone treatment inactivates common bacteria and fungi associated with selected crop seeds and ornamental bulbs

•Ozone disinfected seed-borne bacteria and fungi from seeds and ornamental bulbs.•Gaseous ozone showed better performance than ozonated water.•Pre-soaking the seeds in water increased the efficacy of ozone sterilization.•Sterilization success of ozone depended on the type of the seed, pathogen, and treatment conditions.