ARBOR DAY

holiday which is observed by planting trees (in the USA, Canada, etc.)

Arbor Day is a holiday in which individuals and groups are encouraged to plant and care for trees. Arbor Day originated in Nebraska City, Nebraska, United States but is also celebrated by several other countries. In Japan, a similarly-themed Greenery Day is celebrated.
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Noun
1. a day designated for planting trees
(hypernym) day

arbor day /'ɑ:bɔ:'dei/
danh từ (từ Mỹ,nghĩa Mỹ), Uc ngày hội trồng cây mùa xuân
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[USA] FESTA DEGLI ALBERI [FINE APRILE O INIZIO MAGGIO]