Shinjuku Gyoen National Garden, which became the imperial garden after 1906, brings together several distinct styles. Next to a Japanese garden, in the "stroll garden" category developed in the urban environment, you will find an English landscape garden and a French formal garden laid out around a promenade of plane trees dotted with rose bushes. Further north, some 2 000 plants grow in a tropical greenhouse. Shinjuku Gyoen is also where the Prime Minister holds his annual hanami, a garden party organised for guests to contemplate (mi) the blossom (hana) of the cherry trees (sakura) in spring.