Sterilized Substrate Bag - Wood-Loving Species

A sterile bag of supplemented sawdust substrate, ready for your grain spawn. We hydrate the substrate to field capacity, seal it in a grow bag with a filter patch and sterilize it under pressure at 121°C. Add your colonized grain spawn, mix it through by hand and let it colonize.

Why Choose This Bag:

• Sterilized and ready. There's no mixing, hydrating or pressure cooking on your side.
• Moisture already set. The substrate is hydrated to field capacity, so you don't need to add water.
• The right filter for each size. The small bag has a 0.2-micron filter and the big bag a 0.5-micron filter, because more substrate needs more air exchange. Both let the bag breathe while keeping airborne contaminants out.
• Made for wood-loving mushrooms. It pairs with our grain spawn of any wood-loving species.

What's Included:

• Small: 1 sterile 3 lb substrate bag with a 0.2-micron filter patch
• Big: 1 sterile 10 lb substrate bag with a 0.5-micron filter patch

Freshly Prepared:

Every bag is sterilized fresh to order. Please allow approximately 1 week for preparation, sterilization, quality inspection, and packaging before shipment.

How to Use:

1. Work in a clean room or a clean, still space. Wipe the bag and your hands or gloves with alcohol.
2. Open the top of the bag and add fully colonized grain spawn, about 10–30% of the substrate weight. Our grain spawn is made for this.
3. Seal the bag again. A heat sealer works best, or fold the opening tightly and tape it.
4. Shake the bag to mix the grain spawn evenly through the substrate.
5. Incubate at 21–24°C (70–75°F), out of direct light, for a few weeks until the bag is white all through. Then it is ready to fruit.

Storage:

Keep the bag in a fridge or cold room (2–8°C) until you're ready to use it, and use it within 3 months. Do not freeze.

Quality Guarantee:

Every bag is sterilized and inspected before shipment. If your bag is confirmed contaminated upon arrival, before it is opened, contact us promptly with clear photographs within 24 hours for a replacement at no additional charge. Once opened, contamination resulting from handling, spawning technique, or storage is outside our control.