Uncle Myc's Master's Mix All-In-One Mushroom Spawn Bag - 4 lb

Grain Spawn and Substrate in One Bag - 4 lb

Moving spawn into a separate substrate adds handling steps and more chances for contamination. This bag combines a grain spawn layer and a Master's Mix substrate layer, so you work from one container. The substrate is a 50/50 blend of soy hulls and hardwood sawdust, and the bag has a filter patch for gas exchange and a self-healing injection port.

At 4 lb, this bag suits hobbyists trying mushroom cultivation for the first time, and growers who want to test a setup before scaling up. Buy several bags to run a small batch on a regular schedule.

Key Features & Benefits

• All-in-one design — grain spawn and substrate layers share one bag, so you skip a transfer step.
• Master's Mix substrate — a 50/50 blend of soy hulls and hardwood sawdust.
• Filter patch — allows gas exchange while the bag stays closed.
• Self-healing injection port — lets you inoculate without opening the bag.
• Autoclave sterilized — prepared in a certified autoclave before shipping.

Who Should Use Uncle Myc's Master's Mix All-In-One Mushroom Spawn Bag

Home gardeners who want a simple way to start mushroom cultivation, and small-scale growers who want ready-to-inoculate bags, will find this format convenient. It suits anyone who prefers to buy prepared media rather than mix and sterilize their own.

About Uncle Myc's Master's Mix All-In-One Mushroom Spawn Bag

Uncle Myc's makes this 4 lb bag with a grain spawn layer and a Master's Mix substrate layer. The substrate is a 50/50 blend of soy hulls and hardwood sawdust. The bag includes a filter patch and a self-healing injection port. It is sold as a single bag.

Frequently Asked Questions

Q: What is inside the bag?
A: The bag holds a grain spawn layer and a Master's Mix substrate layer. The substrate is a 50/50 blend of soy hulls and hardwood sawdust.

Q: What does the filter patch do?
A: The filter patch allows gas exchange through the bag. This keeps the contents supplied with air without opening the bag.

Q: How do I inoculate the bag?
A: Use the self-healing injection port. It lets you introduce your culture through the bag wall without opening it, and the port is designed to reseal afterward. Follow your culture supplier's instructions for the amount to use.

Q: What is a self-healing injection port?
A: It is a septum-style port in the bag wall that a needle can pass through. The material closes again after the needle is withdrawn.

Q: How does an all-in-one bag differ from separate spawn and substrate?
A: Separate spawn and substrate require you to combine them yourself. An all-in-one bag already has both layers, so there is less handling.

Q: How many bags are in an order?
A: Each listing is for one bag.