What holiday other than Christmas traditionally or originally involved a tree?

: What holiday other than Christmas traditionally or originally involved a tree?
They want to call it a Holiday tree! Tell me my fine fellow Yahoo! Answers friends; Are there any other Holidays aside from Christmas in any other religions as well as the Christian one that originally or traditionally used a tree in some way?

(Bonus question: Why was the Christmas tree tradition originally started?)

Answers and Views:

Answer by Adam
Arbor Day

Answer by tabdor
Earth Day

Answer by Gerald
Well as far as the origin of the Christmas tree Christmas is said to have originally been a Pagan holiday where they would decorate the outside of their homes with evergreen shrubs. I found out some good info on .