The fermentation product containing Bacillus siamensis CB36 demonstrated capabilities in promoting root development, reducing evapotranspiration, and increasing overall yield in various vegetable crops. CB36 exhibits high activity and stability under diverse environmental conditions, produces numerous lytic enzymes, and forms endospores for survival in harsh conditions such as drought or high temperatures. It also showcases plant growth-promoting properties. Consequently, the adaptability and high efficiency of Bacillus siamensis CB36 make it a promising strain for agricultural applications.