Shinjuku Gyo-en or Shinjuku Gyoen National Garden is a large public garden in Shinjuku and Shibuya, Tokyo, Japan. It was originally a residence of the Naitō family in the Edo period. It later became a garden under the management of Japan Imperial Household Agency. It is now a national garden under the jurisdiction of the Ministry of the Environm…Shinjuku Gyo-en or Shinjuku Gyoen National Garden is a large public garden in Shinjuku and Shibuya, Tokyo, Japan. It was originally a residence of the Naitō family in the Edo period. It later became a garden under the management of Japan Imperial Household Agency. It is now a national garden under the jurisdiction of the Ministry of the Environment.