I learned something the other day an I thought I would pass it on. This is probably something everyone else knows but I didn’t. I guess I never really thought about it.
A friend of mine owns one of the largest Mushrooms Farms in Chester County PA and yesterday he gave a few of us a little tour.
Here is what I didn’t know: The soil that they use to grow mushrooms can only be used for “one grow”. After that the soil is exchanged out for newly composted soil (mushroom soil) and the old soil is almost considered a waste product or garbage at that point by the grower. There is an after market for the product but from what I understand the secondary market is very small in comparison to the amount of “used” mushroom soil.
The second run soil is what you and I but for 4.99 a bag. The same soil the mushroom grower sees as garbage.