Negishi Industry was founded in 1944 by a first-generation roofing craftsman who specialized in shrine and temple roofs. He established the company to produce horticultural metal goods using tinplate. In 1966, the second generation introduced the idea of applying techniques from Sendai to create copper, brass, and stainless steel watering cans, specifically designed for bonsai. He also proposed these to bonsai associations. Since then, Negishi Industry has specialized exclusively in the production of watering cans, dedicating itself to perfecting this craft.