Koishikawa Korakuen Garden has approximately 90 plum trees of 35 types, which reach their prime season around late February to early March. Tokugawa Mitsukuni who was responsible for the completion of this garden, is said to have loved plum trees so much that he took on the pseudonym "Bairi" (梅里 = land of plums) when he took part in creative activities such as calligraphy and painting.