The present investigation was conducted on an experimental farm at the El-Kanater Horticultural Research Station in Qayubeia Governorate, Egypt during the 2018 and 2019 experimental seasons. The banana Williams cultivar were plant materials for this research, grown in clay loamy soil and the mates (plantation holes) were 3×4 meters apart under the flood irrigation system. Anyhow, Herosten the commercial name was the source of auxin used in this investigation. This compound contains (1.5 % NAA; 1.5 NAD and 1.5 % NAO), sprinkles were added sprinkles monthly five times during the period from first July to first November at a rate of 0.25, 0.375, 0.50 and 0.625 g per liter. Taking into consideration that sprays treatments were applied covering the whole bunch of each plant, whereas 0.5 liters was found to be sufficient in this concern to study the effect of different concentrations of Herosten sprays on productivity and fruit quality of Williams banana plants. Definitively, it can be shown from the results obtained that, spraying of Williams banana plants grown under similar environmental conditions and horticulture practices adopted in the current experiment with Herosten (auxin) at 0.375 g per liter and/or Herosten (auxin) at 0.50 g per liter is a beneficial method for enhancing production and fruit quality. In comparison, the lowest values of most of the parameters under investigation were typically associated with the control (water spray).