He chose various species of trees that he tested on the substrate to be afforested. He then created a nursery where plants were mixed and then planted on the site, where today lives a forest composed exclusively of native species. The steel corporation was so pleased with the results that in the 18 years since, it has planted forests with this method at sites of its steel mills in Nagoya, Sakai, Kamaishi, Futtu, Hikari, Muroran, and Yawata.[citation needed]