A tree is one of the most needed things to survive of in Mine Blocks. They can be found naturally in forest biomes, or planted with saplings. Each tree contains two to three different blocks. A tree will always have wood, which is required to make much of the needed crafting recipes in the game. Trees also have leaves, and some trees may have apples or oranges in them, although they usually don't. There is one type of tree, the golden apple tree, that have golden apples in them. Golden apple trees grow from golden apple seeds.
The wood blocks of trees are unique, as they can be walked though. When a wood block is mined from a tree, it loses its ability to do that.