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 412 spots.

Photo pakku (CC BY 3.0) — via Wikimedia Commons
A private garden in Shikaoi, Tokachi, with several hundred maples, rare in Hokkaido, around three ponds and five little waterfalls. Opened free to the public for about three weeks each October.