He isn't just a talking tree. He isn't just a talking tree with a unique nose. Voiced by the incomparable Thurl Ravenscroft, he's a male tree who gives birth in front of the waiting crowd!
He doesn't actually say, "Boo-yah." But he has every right to. This happy blooming has been taking place many times a day, nearly every day for fifty years. That's a lot of offspring, and just one of the many ways in which Disneyland takes guests further off the beaten path of everyday expectations than most people would ever guess.