In conjunction with the raising of the bank of a general waste disposal site on Miyajima (Itsukushima) Island, Hiroshima Prefecture, western Japan, the slope surface of the bank was greened with local seedlings and seeds collected on the island in March and April 2021. Even before its designation as a World Heritage Site, construction work on this island had already been regulated by several laws involving various restrictions and had to be carried out with biodiversity conservation based on the conservation and management plan of the local government. As a result of flora surveys conducted in 2021, the presence of 96 species of herbaceous and woody vascular plants (including both native and naturalized species) was confirmed. We will continue the survey to determine the closeness of the vegetation to the initial target. The findings from this project will benefit future greening and revegetation work in conservation areas.