PROBLEM TO BE SOLVED: To provide an ultrafine air bubble-containing water or aqueous solution utilizable of conveniently the ultrafine air bubble-containing water without holding a micro-bubble generating apparatus by a user, a method for producing them, and their uses.SOLUTION: The ultrafine air bubble-containing water or aqueous solution produced by performing a processing discharging ultrafine air bubbles with a particle diameter of diameter of 10-50 μm into water or an aqueous solution for at least 10 hours, is diluted by the user to use it for plant cultivation or the like.