Isshingyou Kouen Great Cherry Blossom: Famous Cherry Blossom Tree under Aso Mountain that is Hundreds of Years Old Kyushu’s most famous and ancient cherry blossom tree sits under Asu Mountain in Kumamoto Prefecture — the Isshingyou Kouen Great Cherry Blossom. This spectacular and beautiful cherry blossom tree is over 400 years old. It measures 14 meters high and 7 meters in diameter, and its branches extend 26 meters. It is said to be the most extraordinary of cherry blossom trees. It is said that this large mountain cherry blossom tree was planted by villagers during Japan’s Warring States period to commemorate fallen warriors.