In recent years, turning Christmas trees upside down—and occasionally ... saw pagans worshipping an oak tree. To stop them, he cut the tree down, and a fir grew in its place.

Their distribution has seen them develop different flowering times, which has been a key reproductive barrier, but that didn’t stop hybridization ... trees are known as “upside down trees ...

The Westfield San Francisco Centre's sparkly upside-down Christmas tree, hanging from the mall's skylit dome, made a splash as an Instagram star in 2016. The perfect backdrop for a holiday selfie ...

During peak visitation season, "we have multiple inquiries daily about what becomes of the trees once they stop growing upside down," said Jodi Joseph, director of communications at Mass MoCA. "People ...