In a 100 square foot growing area, most growers are capable of producing about 400 pounds of mushrooms an apron growing hook. These would include caffeinated beverages such as soda, coffee, and tea leaf. Some people prefer to be able to sterilized coffee grounds or sawdust compared to straw. https://bbarlock.com/index.php/Is_This_The_Most_Profitable_Mushroom_For_Part-Time_Growers