Minecraft wiki entry for Tree, associated text: Oaks are among the most common trees in the game. They have the smallest space requirements, and along with dark oak trees, they can drop an apple when a leaf block is destroyed. In swamp biomes, a slightly larger variant of the regular oak tree with vines is generated, which can naturally generate in shallow water. Large (or "fancy") oaks may also grow or generate in place of regular oaks; these are taller and may feature branches. A rare variant is its smallest configuration, colloquially known as a "balloon" oak.