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Finally, a Mushroom Growing Substrate That Won’t Pollute Our Environment!

These are truly biodegradable under ASTM D6954

Our biodegradable bags break down in the presence of oxygen, UV radiation, and anaerobic bacteria. The patented additive oxidizes polymer chains until the dalton number is below the atomic mass of water, at which point it can be digested by a soil biome like any other carbon-based nutrient. Because it's impossible to eliminate both anaerobic bacteria and oxygen without using heat, they continue to degrade while waiting to be purchased.

For best results, use within 30 days of purchase.

Measuring 5x4x18" and with a 0.2 micron filter, these spawn bags are able to hold 3-4lbs of your favorite grain.


CALIFORNIA RESIDENTS: due to the government assuming that every home has access to an industrial incineration device, you are required to fill out a Hold Harmless Agreement and email it to before product can be shipped.

CLICK HERE for a PDF Hold Harmless Agreement (California residents only)

As Ray Loflin of Willow Ridge Plastic puts it,

“Oxo-biodegradable plastics are designed to biodegrade in ANY environment. It can’t be guaranteed where a customer will dispose of waste, therefore we have a technology that is an insurance policy on covering any environment it goes to. That includes municipal waste, recycling centers, or even litter (accidental or otherwise).

The important thing to note is that ASTM D6400 and D6868 are industrial composting standards. Those are not home composting standards because there is no such thing as a home composting standard. Industrial composters are massive composting facilities that exert lots of energy and water to keep the material in ideal conditions for slow incineration, which is what is happening to the material. It should also be noted that D6400 is under critical review at ASTM because it does not meet the needs of industrial composters nation wide, who have begun to turn away ‘industrial compostable’ products. They take up to 180 days to meet the requirements of the standard, which is 90 days longer than most composters want it to last.

On top of that, if a product approved under BPI guide lines, or ASTM D6400 guide lines, and ISN’T disposed of in an industrial composter, then it remains as waste and nothing will change that. Therefore, it’s an effective technology in only very specific conditions.

However, an oxo-biodegradable plastic will both degrade and BIODEGRADE in a home composter, unlike other technologies. Because the technology doesn’t require water and high heat to perform, it means there is lots of flexibility.

Unicorn Bags will have a hard time getting on the BPI list because the Biodegradable Plastics Institute is solely run by PLA, Starch, and composting companies. They do not let technologies like oxo-biodegradables into their ‘club’ since they don’t use one of their technologies. None of our products will pass compostability testing because those tests were designed ONLY for hydro biodegradable resins (PLA, starch, etc). It’s essentially saying you want to judge a motorcycle on safety standards designed for a car. ASTM D6954 is the standard guideline for testing Oxo-biodegradable materials.”

Regular price $13.00 USD
Regular price Sale price $13.00 USD
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Customer Reviews

Based on 1 review
Benjamin Martin (Florida, United States)
NPS score:
0 (Not at all likely)
10 (Extremely likely)
Likes: Biodegradable
Improvements: Will let you know….

So far bags are excellent…..