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 柳田亮 (CC BY-SA 3.0) — via Wikimedia Commons
Four hectares of hillside in Sera planted with about one million nemophila and 300,000 shibazakura, which come into flower together from late March to early May. Run by the same group as nearby Sera Kogen Farm.