Mud Block

A Mud Block is a Dirt-like Block that can be found Underground and crafted in Water while holding a Dirt Block. Mushroom Grass Seeds and Jungle Grass Seeds can only grow on mud.

When placing a Jungle Grass Seed on a Mud Block at below a certain depth (700ft in small worlds, 1,000 feet on large worlds), you can create an Underground Jungle. Mushroom Grass Seeds will only grow at below 0ft.