Coarse dirt is found in the ground that can be mined. Picking up Grass or Mycelium will drop dirt. The fastest way to mine dirt is with a Shovel. Using a Hoe on dirt will produce Farmland used for growing Potatoes, Carrots, Melons, Wheat and Pumpkins. Coarse Dirt will eventually turn into Grass if there is any next to the dirt and sunlight is reaching the block. The difference between Dirt and Coarse Dirt is that Coarse Dirt will replace it in Mega Taiga, Mesa and Savanna Biomes.