|Catches fire from lava||
|— Jasper Boerstra|
Kelp is an underwater plant that generates in most oceans.
From block loot
Kelp can be bought from wandering traders for 3 emeralds.
Kelp can be placed underwater by hand, or anywhere by the use of commands such as
/setblock. Placing it by hand gives it a random
age value between 0 and 24. Kelp can only be placed in water source blocks or downward flowing water, not horizontally flowing water.
Besides for decoration, kelp can be used to turn flowing water into water source blocks, which can be useful for faster bubble column elevator creation. Any building block can be placed on top of a kelp plant, which can be useful for building underwater.
|Dried Kelp||Kelp +
Placing kelp into a composter has a 30% chance of raising the compost level by 1.
Kelp can be planted on a broad variety of blocks. It grows underwater if it has either a source block of water or flowing water above it. If flowing water is above it, the kelp plant transforms the flowing water into a water source block when the plant grows into it. Neither players nor dispensers can remove the water source block a kelp grows in without breaking the kelp first.
Kelp, when planted, is generated with a randomly chosen age value, which can be checked when pressing F3[Java Edition only]. The age value of a newly planted kelp plant varies randomly from 0 to 24. Each time the kelp grows in height by one block, the newly generated top of the kelp plant increases its age by 1. When the top block of the kelp plant reaches an age of 25, it stops growing. This means that kelp can naturally grow to a height between 2 (if the first kelp plant had an age of 24) and 26 blocks (if the first kelp plant had an age of 0).
When a kelp plant block is broken, the age of the kelp plant block underneath is randomized to a value from 0 to 24 and the kelp continues growing until it reaches age 25. It is possible to use this mechanic to cultivate a kelp plant to increase its growth height beyond its natural maximum height of 26 blocks. This can be done by breaking the very top of the kelp plant each time it reaches age 25. A kelp plant cultivated by a player in this way repeatedly grows until it reaches the water surface.
Each time it receives a random tick, kelp has a 14% chance of growing.
Kelp farming is similar to farming sugar cane, although kelp must be placed underwater. Automation of harvest is easier because, as of the aquatic update, items float up in water.
Java Edition: 
|Sound||Subtitle||Source||Description||Namespaced ID||Translation key||Volume||Pitch||Attenuation distance|
|Block broken||Blocks||Breaking the block||1.0||0.8||16|
|None[sound 1]||Blocks||Falling on the block with fall damage||None[sound 1]||0.5||0.75||16|
|Block breaking||Blocks||Mining the block||0.25||0.5||16|
|Block placed||Blocks||Placing the block||1.0||0.8||16|
|Footsteps||Blocks||Walking on the block||0.15||1.0||16|
|?||Breaking the block||?||?||0.8|
|?||Falling on the block with fall damage||?||?||?|
|?||Mining the block||?||?||0.5|
|?||Jumping from the block||?||?||?|
|?||Falling on the block without fall damage||?||?||?|
|?||Walking on the block||?||?||?|
|?||Placing the block||?||?||0.8|
|Name||Namespaced ID||Item form?||Translation key|
|Kelp||Namespaced ID||Numeric ID||Translation key|
|Name||Default value||Allowed values||Description|
|age||A freshly-planted kelp starts with a random age between 0 and 24.|
Below age 25, a kelp may try go grow more kelp above it with the same age value incremented by one.
Kelp stops growing at age 25.
|Name||Default value||Allowed values||Description|
|age||The age of the kelp. The kelp renders as a non-top piece if there's simple other kelp above it.|
|This page would benefit from the addition of isometric renders.|
Please remove this notice once you've added suitable isometric renders to the article.
The specific instructions are: To match other Minecon annoucement features: a Minecon Earth gif of kelp.
|Java Edition Classic|
|May 21, 2009||Notch shows interest in adding a "seaweed" block.|
|November 18, 2017||Kelp plants were shown in a clip of MineCon Earth.|
|18w07b||Kelp now behaves more like water, meaning mobs can no longer spawn within the plant under water nor can they replenish their breath by swimming through it.|
|18w10a||The texture for kelp has now been overhauled.|
|18w14a||Top of the kelp textures have now been shifted slightly downwards.|
|The generation rules for kelp have now been changed, it now mainly generates in cold ocean biomes and can no longer generate in warm oceans.|
|18w20a||The "kelp_top" has now been changed ID to "kelp" and "kelp" has now been changed to "kelp_plant", for both the block and item forms.|
|pre2||Kelp is now destroyed by sponges.|
|pre6||Added 5 new sound events that apply to kelp: |
|1.14||19w03a||Placing kelp into the new composter has a 10% chance of raising the compost level by 1.|
|19w05a||Kelp now has a 30% chance of increasing the compost level in a composter by 1.|
|1.16||20w11a||Kelp can now be grown with bone meal.|
|1.4.0||beta 220.127.116.11||Added kelp.|
|beta 18.104.22.168||The kelp item texture has now been updated to the Java Edition's.|
|1.5.0||beta 22.214.171.124||The texture of the kelp plant has now been updated.|
|1.10.0||beta 126.96.36.199||Kelp can now be bought from wandering traders for 3 emeralds.|
|1.11.0||beta 188.8.131.52||Kelp can now be used to fill composters.|
|Legacy Console Edition|
|TU69||1.76||Patch 38||Added kelp.|
Naturally generated kelp in an ocean biome.
What kelp looks like without water (water removed using a resource pack).
Kelp within a coral reef.
- "How We Ruin-ed Minecraft" – Minecraft.net, March 5, 2018