Seafloor Gardening
<iframe width="560" height="315" src="https://www.youtube-nocookie.com/embed/aZZIj4fLUng" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe>Spreadable blocks (like Grass Blocks) now ignore water that is above them, making them survive and spread underwater.
This is a Server-Side mod! (still works in singleplayer of course)
Keep in mind:
Blocks (for example: Grass Blocks) may need Light to spread, and water reduces light levels!
So place down some light sources.
