Hokkaido where my grandmother lives is famous for sunflowers. Hokuryu has the largest sunflowers fields in Japan, visitors like to visit Himawari-no-sato at Hakuryu, Chiebun garden at Nayoro. and also at the Asahigaoka Observatory in Memanbetsu in mid september to early October. Mexican Sunflowers also can be seen at Shika Park at Oiwake. See this page.