Seaweed is a block found in an ocean biome.
Seaweed naturally generates in the ocean biome.
Seaweed can be crafted into eight pieces of string by placing it in the crafting grid.
Seaweed grows when it is planted into a water source block on sand.
It can grow only if there is a water source block above it, which is then replaced by a seaweed block. This causes a water update.
Seaweed increases the player's movement speed equal to walking on land while in water, as long as the seaweed is two blocks high.