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 おにく (CC0) — via Wikimedia Commons
A small temple known for its white spider lilies, rare to see growing in numbers, flowering with the red ones in September. Entry about 300 yen.