Cassine laneana, commonly known as the Bermuda Olivewood, is a species of large tree in the staff vine family, Celastraceae, that is endemic to the islands of Bermuda.
From the en.wikipedia.org
During production months Miyazaki occupies a corner desk at Studio Ghibli, a vine-covered cluster of buildings he designed in a Tokyo suburb for himself and a full-time staff of 150.