Pine was a species of tree which grew in cold climates. (COMIC: A Christmas Story)
In 1888, Wovoka was cutting down pine trees in the Nevada mountains. (PROSE: The Book of the War)
Behind the scenes
In non-valid sources
A blue illustration of a pine tree was present on Dipper Pines' hat. (TV: Untitled [+]Loading...["Untitled (Disney XD TV story)"])