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From the Minecraft wiki: 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 incr...
Answer
#1: Initial revision
From the [Minecraft wiki](https://minecraft.wiki/w/Kelp): > 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. Therefore, you can limit kelp height by repeatedly placing down kelp until it has the `age` value necessary (height can be minimum 2). Point at the block and use the debug menu (`F3`) to see the value (right side of the screen). If you're in creative, or have commands enabled in survival, you can use commands to place it (height can be minimum 1): ``` /setblock ~ ~ ~ kelp[age=25] ``` Bonemeal will always allow you to grow kelp past this limit, despite having placed the kelp down with a specific age.