Talk:Glowing Mushroom Biome/@comment-1466854-20131106205351

A couple things worth note here. First, hardmode has just as many enemies underground as on the surface, you may see less because of the presence of an NPC (which lowers local enemy spawns). Second, it can only spread through mud -with an adjacent surface-. If you make a block of mud, only the outside surface can spread the glowing mushroom grass, and only so far as there is continued contact. If you want to make a thicker floor, try making it two blocks thick (one if it's on another surface) and adding more layers only after the initial one(s) become completely covered.