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 HarueFukuiJapan (Public domain) — via Wikimedia Commons
About 600 somei-yoshino make a 2.2 km tunnel along the Asuwa River in central Fukui, one of Japan's top 100 cherry spots. During the Fukui Cherry Festival the trees are lit up from 6 to 10 pm; free.