So was looking at ads from fellow caregivers to get an idea of what everyone was offering and featuring and what the norms for my area seemed to be. Found this phrase in one of the ads. Anyone care to explain the term "mushrooms" because it is a new one to me. Wouldn't want to be in the middle of an interview and have a parents ask something. I have my own idea of what it refers to but thought I would ask.

"our daycare space is not in a basement but on the main level of our home, no mushrooms here!"

Not all basement playrooms are dark, damp, dungeons suitable only for mushrooms or at least that is my interpretation of the term but am looking for other ideas.