The phrase "a tree under which" is correct and usable in written English.
It can be used to describe a location or setting where something occurs, typically indicating that something is happening beneath the tree.
Example: "We found a quiet spot to have our picnic, sitting under a tree under which the shade provided relief from the sun."
Alternatives: "a tree that provides shade" or "a tree beneath which".
Brancusi was a tree under which an artist could grow.
Allan Graves, spokesman for the Anne Arundel County Fire Department, said the lightning had struck a tree under which the victims waited to resume a rugby tournament at Annapolis Middle School.
On Wednesday she took a hat stand to the town's Phoenix Theatre and asked children to imagine it as a tree under which they had fallen asleep and woken up 20 years later.
There were dead animals - goats, sheep and cats, and a tree under which 300 birds lay on the ground, one survivor said.
A story claims that after boarding a ship in Aguada, he buried the treasure captured under a palm tree, under which he also buried the body of a comrade that fell during that battle.
It was made from the wood of a "sacred tree," under which no grass grew, and which caused any animal that came near it to die.
I asked him about it, and he told me it was made from the wood of a "sacred tree," under which no grass grows, and which causes any animal that comes near it to die.
He pointed to a large shade tree under which foreign dignitaries would sit, and another spot where musicians played.
They put down an outdoor terrace of gray and white marble tiles, taking great care to preserve a huge silver linden tree, under which they later served almost all their meals.
The tree is to pose as a simile for the tree under which Hester took his life in 2005.
Maps are available of the temple complex, which is laid out as an elongated triangle, a shape intended to resemble the leaf of a bodhi tree -- the tree under which the Buddha sat when he attained enlightenment 2,500 years ago.
