During Japan’s rule over the Korean Peninsula, from 1910 to 1945, Yoshinos were planted as part of an effort to instill “cultural refinement” in colonial subjects, said David Fedman, the author of “Seeds of Control,” a 2020 book about Japanese forestry in colonial Korea. … The politics of cherry trees have ebbed and flowed along with Japanese-Korean relations, and nationalist claims about them have mostly crowded out scientific nuances, said Professor Fedman, who teaches history at the University of California, Irvine.