Today (4 May) is Greenery Day in Japan!
Do you know what this holiday is about?

Greenery Day aka みどりの日 falls on 4 May each year.
It is part of the Golden Week holidays in Japan.
Greenery Day is for people to show their appreciation to nature
The holiday was installed because the late Showa emperor was fond of plants.

Source: https://study.gaijinpot.com/lesson/holidays/greenery-day/