Related Program: NatureNotes Wool Sewer Gall By Rudy Mancke • May 2, 2017 Related Program: NatureNotes TweetShareGoogle+Email Cotton Candy Plant, a.k.a. the Wool Sower Gall, on an Oak sapling. Anita Gould, [CC BY-NC 2.0] via Flickr This appropriately named gall occurs in White Oak trees. Listen Listening... / 1:00 NatureNotes is a production of South Carolina Public Radio. Tags: NatureNotesNatureSCETV AppTweetShareGoogle+EmailView the discussion thread.