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 Forestowlet (CC0) — via Wikimedia Commons
A botanical garden about 10 minutes by car from Miyako Airport, whose 400 m deigo avenue becomes a tunnel of red flowers in spring. Bougainvillea and hibiscus flower here all year. Free.