Board Thread:Administrator's Noticeboard/@comment-26368573-20131212053008/@comment-1250011-20131212125531

The pumpkin is a plant in the world, which is destroyed to give the player the Pumpkin block. There's not enough information to be given on the plant side of it simply because there's not. "The Pumpkin Plant is a plant that occurs naturally around the time of Halloween, and can be planted with Pumpkin seeds purchased from the Dryad." That would literally be the entire wiki page, with an image or two added in.