Yushima Tenmangu Shrine (Yushima Tenjin) has been beloved since the Edo period as a famous place to view plum blossoms. The precincts, which enshrine Sugawara no Michizane (the deity of scholarship), are an amazing sight when the approximately 300 plum trees - mainly Shirokaga white plums - bloom. Lord Sugawara was exiled to Dazaifu in Kyushu. He wrote a famous poem that read, "Let the east wind blow and send your fragrance / Oh, plum blossoms / Do not forget the spring / Even though your master is gone." The plums are at their best from mid- to late February each year, but it's a good idea to check the flower information before you go (see the below URL).