Kelp and sea grass grows up into flowing water and makes it a source block
The bug
Kelp and sea grass (when bone meal is used) can grow into flowing water blocks, not just sources, and as a byproduct of that, the flowing water becomes a source block.
How to reproduce
- Create a water column of source blocks, with flowing water at the top
- Place kelp at the bottom and watch it grow (bumping up random tick speed if needed)
- Observe the flowing water at the top is now a source block. (destroying the top kelp and using a bucket or debug screen can confirm this)
Code analysis
Code analysis by [Mod] Avoma can be found in this comment.
Linked Issues
is duplicated by12
MC-132773Tall seagrass or kelp growing when underneath flowing water turns the flowing water into source waterDuplicateMC-133392kelp grows into flowing water and converts it to full waterDuplicateMC-134968Kelp grows in flowing water and creates source blocksDuplicateMC-135451Kelp creates water source block if it is growing under a flowing oneDuplicateMC-136039Water level rising a block and slowly expanding over an areaDuplicateMC-136971Kelp grows beyond water, and makes new source blockDuplicateMC-151450Kelp creates source blocks through flowing waterDuplicateMC-154540Seaweed InvasionDuplicateMC-156392Kelp grows into and pushes waterDuplicateMC-164863Kelp generating water source blocks. DuplicateMC-195898Kelp Turns Flowing Water To Source BlocksDuplicateMC-231352Kelp growth causes flowing water to turn into water source blocks.Duplicate
![[Mod] Avoma](../../../data/avatars/users/86198.png){kind=small}
- Unresolved
Matthew- 82
- 40
- Confirmed
Low- Gameplay
- Block states
- kelp seagrass tall_seagrass
1.13-pre7 - 25w02a
1.13-pre7 1.13-pre8 1.13-pre9 1.13 18w30b 18w31a 18w32a 18w33a 1.13.1-pre1 1.13.1-pre2 1.13.1 1.13.2 18w47b 19w11b 19w12a 1.14.2 1.14.3 1.15.2 20w07a 1.16 1.16.1 20w29a 1.16.2 1.16.4-pre2 1.16.4 20w49a 21w03a 21w06a 21w11a 21w14a 1.17 1.17.1 21w39a 1.18.1 1.18.2 22w17a 1.19 1.19.2 1.19.4 23w17a 1.20.1 1.20.3-rc1 1.21 1.21.3 1.21.4-pre1 1.21.4-pre3 1.21.4-rc3 1.21.4 25w02a
Created Issue:
Kelp grows up into flowing water and makes it a source block
![[Bot] Arisa](../../../data/assets/gravatar/mustek2.png){kind=small}
Kelp can grow into flowing water blocks, not just sources, and as a byproduct of that, the flowing water becomes a source block.
To reproduce:
- Create a water column of source blocks, with flowing water at the top
- Place kelp at the bottom and watch it grow (bumping up random tick speed if needed)
- Observe the flowing water at the top is now a source block. (destroying the top kelp and using a bucket or debug screen can confirm this)
Kelp and sea grass grows up into flowing water and makes it a source block
Kelp can grow into flowing water blocks, not just sources, and as a byproduct of that, the flowing water becomes a source block.
To reproduce:
- Create a water column of source blocks, with flowing water at the top
- Place kelp at the bottom and watch it grow (bumping up random tick speed if needed)
- Observe the flowing water at the top is now a source block. (destroying the top kelp and using a bucket or debug screen can confirm this)
The bug
Kelp and sea grass (when bone meal is used) can grow into flowing water blocks, not just sources, and as a byproduct of that, the flowing water becomes a source block.
How to reproduce
- Create a water column of source blocks, with flowing water at the top
- Place kelp at the bottom and watch it grow (bumping up random tick speed if needed)
- Observe the flowing water at the top is now a source block. (destroying the top kelp and using a bucket or debug screen can confirm this)
![[Mod] Michael Wobst](../../../data/avatars/users/37868.png){kind=small}
is duplicated by
![[Mod] Neko](../../../data/avatars/users/92901.png){kind=small}
is duplicated by
relates to
is duplicated by
is duplicated by
relates to
![[Mod] tryashtar](../../../data/avatars/users/41963.png){kind=small}
is duplicated by
is duplicated by
![[Mojang] Nathan Adams](../../../data/assets/gravatar/dinnerbone.png){kind=small}
![[Mod] Asteraoth](../../../data/avatars/users/92886.png){kind=small}
is duplicated by
![[Mod] violine1101](../../../data/avatars/users/92858.png){kind=small}
is duplicated by
is duplicated by
is duplicated by
![[Mod] Greymagic27](../../../data/avatars/users/92875.png){kind=small}
![[Mojang] Adrian Östergård](../../../data/assets/gravatar/nighter.jpeg){kind=small}
relates to
is duplicated by
![[Mod] Chandler](../../../data/assets/gravatar/triwonder81.png){kind=small}
![[Helper] gaspoweredpick](../../../data/avatars/users/80904.png){kind=small}
![[Mod] markderickson](../../../data/avatars/users/18946.svg){kind=small}
![[Mod] SPGoding](../../../data/avatars/users/44622.png){kind=small}
is duplicated by
![[Helper] Michał](../../../data/avatars/users/43368.png){kind=small}
![[Mod] ampolive](../../../data/avatars/users/18949.svg){kind=small}
The bug
Kelp and sea grass (when bone meal is used) can grow into flowing water blocks, not just sources, and as a byproduct of that, the flowing water becomes a source block.
How to reproduce
- Create a water column of source blocks, with flowing water at the top
- Place kelp at the bottom and watch it grow (bumping up random tick speed if needed)
- Observe the flowing water at the top is now a source block. (destroying the top kelp and using a bucket or debug screen can confirm this)
Code analysis
Code analysis by [Mod] Avoma can be found in this comment.
![[Bot] Arisa](../../../data/avatars/users/43007.png){kind=small}
relates to
relates to
![[Mojang] slicedlime](../../../data/assets/gravatar/slicedlime.jpeg){kind=small}
![[Mod] EVGENSYPERPRO](../../../data/avatars/users/92853.png){kind=small}
![[Mod] Jarl-Penguin](../../../data/avatars/users/92849.png){kind=small}
Confirmed in 1.21.4 prerelease 2
Create a water source block and make it flow to a side and then one block down. Then place coral, coral fan, kelp or seagrass there. After that remove the source block and see that the placed block is now inside a new water source block.
As far as I tested this only happens to force-waterlogged blocks of sea plants as well as coral and coral fans, but not optionally waterlogged blocks like fences or chests.
I think it may relate to MC-133354, but this is a bit different. See screenshots.
Thank you for your report!
However, this issue is a Duplicate of MC-133354.
If you have additional information, please add it to that report.
Please search before reporting, as it's likely that one exists already.
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Does MC-133354 describe your issue?
Relates to MC-133354 - Kelp and sea grass grows up into flowing water and makes it a source block?
Duplicate of MC-133354
Duplicate of MC-133354
Thank you for your report!
We're actually already tracking this issue in MC-133354, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki
Thank you for your report!
We're tracking this issue in MC-133354, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – ✍️ Feedback and Suggestions – 📖 Game Wiki
– I am a bot. This action was performed automagically! Please report any issues in Discord or Reddit
Thank you for your report!
We're tracking this issue in MC-133354, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
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📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki
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Related to MC-133354, MC-134229 and MC-130890
Step to reproduce:
Step 1: Copy the setup (see below), you can make as high as you want
Step 2: Break the blue glass
Step 3: When the water flows down and touch the ground, quickly place the kelp, seagrass, coral, dead coral, coral fan, dead coral fan or conduit before the water spreads
Step 4: Done!
Note: You can place a block next to the kelp, seagrass, coral, dead coral, coral fan, dead coral fan or conduit to updates the water
introduced primarily in pre-3
Isn't this "works as intended?"
Affects 1.13.1-pre2.
Confirmed in Release 1.13.1
Please leave this alone, it's useful for making water elevators with bubble columns and doesn't affect the game otherwise.
@James Spatig It messes up farms that use bonemeal, and isn't intended behaviour either
yah if you are trying to make a kelp farm and you didn't make it deep enough it can seriously mess up the farm by causing items to not move towards the hoppers due to the flowing water blocks becoming source blocks.
I understand why they did this, otherwise a single missing source block in the ocean could ruin the growth. However this is still an oversight.
In my opinion, it should only be able to grow into flowing water (and turn it into a sourceblock) if the block above is also water (source or flowing). This would make it the best of both worlds, the kelp mechanic to create functional bubble columns can stay and farms will not be ruined.
From a logical perspective, this also makes the most sense in my opinion as it would still allow kelps to grow normally in the ocean while preventing weird behaviour like this:
Just to clarify: Growing Kelp shouldn't create water source blocks, but players should be able to place Kelp in order to create water source blocks.
Affects 1.16-rc1, a growing kelp created a water source block
Affects 1.16
Affects In 1.16.1 and 20w29a
Can confirm in 20w49a.
Can confirm in 21w03a.
Can confirm in 21w06a.
Can confirm in 21w11a.
Can confirm in 21w14a.
Can confirm in 1.17.
Can confirm in 1.17.1. I always thought this was intended.
Seems to work in another world in what acts like the Nether in the infinite snapshot. Also works in the Nether in 1.17.1 (with cheats to place some water to start flowing).
The kelp creates a water source block wherever placed in water. One water bucket and kelp can create an infinite water source, if done right, no bone meal or growth time needed.
Can confirm in 21w39a.
Can confirm in 1.18.1.
Can confirm in 1.18.2.
I can confirm this in 22w17a. Here's a code analysis of this issue.
The following is based on a decompiled version of Minecraft 1.18.2 using MCP-Reborn.
Code Analysis:
If we look at the above classes, we can see that seagrass requires Blocks.WATER above it in order to grow and similarly, kelp can only grow into Blocks.WATER. Since Blocks.WATER includes both flowing water and water source blocks, both kelp and seagrass can grow into flowing water.
Can confirm in 1.19.
Can confirm in 1.19.2.
Can confirm in 1.19.4 and 23w17a
Confirmed in 1.21.4 prerelease 1
Confirmed in 1.21.4 prerelease 3
Can confirm in 1.21.4 release candidate 3.
Confirmed in 1.21.4
Affects 25w05a