According to the Examiner:
HIH Prince Hisahito, the future Emperor of Japan, celebrated his sixth birthday today. To celebrate the milestone, the Imperial Household Agency released pictures of the young Prince and gave details about his life and hobbies. He is a good student and in recent months has begun to show interest in learning the difficult “kanji” characters. The Prince enjoys working in his garden, raising and harvesting vegetables. His current focus is on rice plants growing in a bucket…He has collected insects on the grounds of the Imperial Palace with HIM Emperor Akihito. The Prince will move into elementary school in April.