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 Hales Suen (CC BY 2.0) — via Wikimedia Commons
A dead-straight road through horse-farm country lined for about 7 km with some 2,000 cherry trees, about 70% of them Ezo mountain cherry. The Shizunai Cherry Blossom Festival is held around early May. No pets, to protect the grazing horses.