In a 100 square foot growing area, most growers are capable of producing about 400 pounds of mushrooms in the growing spiral. These would include caffeinated beverages such as soda, coffee, and aid. Some people prefer a cordless sterilized coffee grounds or sawdust instead of straw. https://spudz.org/index.php?title=Is_This_The_Most_Profitable_Mushroom_For_Part-Time_Growers