Mud cannot be planted with Glowing Mushroom Seeds? [duplicate]

I have mud blocks in place under my house. I read somewhere that depth doesn't matter though. When I left click seeds above or onto the mud block, nothing happens. Below is a screenshot for reference

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1 Answer

Mushroom Grass Seeds must be planted on mud blocks.

Looking at your screenshot, it seems that you are trying to plant them on clay blocks, which will not work.

Mud blocks are darker than clay blocks

            

^ mud         ^ clay