Kelp

Kelp is aquatic algae found in most oceans. It can be planted underwater and grows over time (though not forever) or from bone meal usage. Smelting it results in dried kelp, which is edible and craftable into dried kelp blocks.

Kelp can be mined instantly with any tool or with the player's fist. Removing water from the kelp block destroys the kelp, in Java Edition, the water cannot be removed by using a bucket. Breaking one part of a kelp stalk destroys all kelp blocks above it. Each block drops a kelp item.

Kelp naturally generates in any ocean biomes (except in frozen, deep frozen and warm), near and around seagrass. Each chunk has 1⁄18 chance to generate a vegetation of kelp.