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Seaweed is a block found in an ocean biome.
When broken, seaweed drops itself. If the block under a seaweed is not another piece of seaweed or sand, it drops as an item].
Seaweed naturally generates in the ocean biome.
Seaweed can grow upwards in water in the same way that sugarcane and bamboo grow on land. If the block above seaweed is filled with a water source block, it can be replaced with seaweed in water.
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.