Question

When did Buddha sit under the Tree?

Answer 1

If he want sit alone then he sit under the tree and do meditation

Answer 2

Gautama Buddha attained enlightenment (bodhi) while meditating underneath a Ficus religiosa. According to Buddhist texts, theBuddha meditated without moving from his seat for seven weeks (49 days) under thistree. A shrine, called Animisalocana cetiya,was later erected on the spot where he sat.