How do I keep Endermen out of my mushroom farm?

Question

I created a nice dark underground room for the growing of mushrooms. Sometimes mobs spawn there but that hasn't been a problem until the Endermen decided they liked the blocks in my walls.

Is there a way to modify a small room which is suitable for growing mushrooms, to be less comfortable to Endermen? I can only think of putting water everywhere so that it will kill the Endermen, but that will also limit my growing space.

Answer

Endermen cannot spawn (or teleport, or walk) into an area that is only 2 blocks high as they're 2.9 blocks tall. Therefore, just make sure that the roof of your "farm" is only 3 blocks above the floor. Source

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