Cherry blossom is three weeks of it. Flip through the other forty-nine — and watch what's in bloom move up and down the country.
The calendar is the way in. Underneath it sits the ordinary thing — search, filter by month or flower, and open any of the 444 spots.

Photo Suresh Aru (CC BY 2.0) — via Wikimedia Commons
About 30 sagaribana trees line some 150 m of Baba-dori in Shuri Sakiyama-cho. Their powder-puff flowers open after dark and drop by morning, so this is an evening walk, and the street is lit up in season. Free.