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 Bariston (CC BY-SA 4.0) — via Wikimedia Commons
A temple built on great outcrops of rock above the Seta River, where Murasaki Shikibu is said to have begun The Tale of Genji. In late November it opens in the evening with the maples lit up. Entry 600 yen.