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 Takashi Hososhima (CC BY-SA 2.0) — via Wikimedia Commons
Okinawa's cosmos flower in winter. In the field opposite Yomitan Junior High School in Zakimi, about a million of them come into bloom, usually from late January into early February.