Made of on/about 80% hardwood sawdust, 20% grain mix with mushroom trimmings and mycelium. Product is 100% sterilized prior to growing our specialty mushrooms, and is the direct biproduct of our farm. Product is aged and you will often have garden loving worms in it as well. We have a surplus so pricing is cheap this year at $50 for pickup load and $100 for a small trailer load. Larger trailer will be negotiated. Due to challenges cashing check in the past we have a CASH only policy. Thank you for understanding in advance. We have fresh mulch available as well... Fresh mulch may fruit oyster mushroom. Please Note: we are selling compost and mulch. Know what you eat... Delivery is not available at this time. Pick up at farm only. Mon-Sat and appointment needed prior to showing up. Thank you for your business and the opportunity to serve.