Why CO2 Mushroom Bags Dont Work

Why CO2 Mushroom Bags Dont Work

When embarking on indoor gardening, optimizing the growing environment for your plants is essential. This often includes considering how to enhance carbon dioxide (CO2) levels, a critical component of photosynthesis, which can significantly influence plant growth and productivity. Among the various methods of CO2 supplementation, CO2 mushroom bags have emerged as an option. These bags utilize the natural metabolic processes of fungi to produce CO2 as a byproduct. However, while appealing for their simplicity and eco-friendliness, they present several limitations that might not make them the ideal choice for every indoor grower. This article delves into the reasons why CO2 mushroom bags may not be effective for indoor growing, exploring their output, control limitations, and the overall impact on plant growth compared to other CO2 supplementation methods.


CO2 supplementation is an essential aspect of indoor gardening that can significantly enhance plant growth by improving photosynthetic rates. However, the use of CO2 mushroom bags for this purpose has several limitations, particularly when compared to other methods of CO2 supplementation like burners, tanks, and controlled systems.

Photosynthesis Cycle Diagram

Limited CO2 Output

One of the primary challenges with CO2 mushroom bags is their relatively low output of CO2. These bags rely on the metabolic processes of fungi or other microbes, which can only produce a small amount of CO2. This output is generally insufficient for larger indoor grow operations and might not significantly impact CO2 levels unless used in very small spaces. 

co2 bag

Lack of Control

Another significant drawback is the inability to control the CO2 release from these bags. In indoor growing environments, precise control over CO2 levels is crucial for optimizing plant growth and health. Unlike CO2 tanks or automated systems that allow for adjustable and consistent CO2 delivery, the rate of CO2 production from mushroom bags can vary and is not adjustable​.

Inconsistency and Safety Concerns

The inconsistency in CO2 output can also lead to periods where the CO2 levels are either too high or too low, which is not ideal for the plants. Additionally, in larger setups, maintaining safety with proper ventilation is crucial to prevent CO2 from reaching harmful levels. Mushroom bags do not offer the same level of safety and consistency as more sophisticated systems equipped with CO2 monitors and automatic regulators​.

Better Alternatives

For serious growers looking to integrate CO2 into their indoor growing setups, options such as CO2 burners or filled CO2 tanks, provide greater efficiency and control. These systems can maintain the CO2 at optimal levels for plant growth, which is generally considered to be between 1200-1500 PPM​.

co2 tank

While CO2 mushroom bags might offer a low-cost and simple solution for very small, hobbyist setups, they fall short in providing the controlled, consistent, and safe CO2 environment that is vital for larger, more professional indoor gardens. For those looking to enhance their growing environment effectively, investing in a more reliable CO2 supplementation system will yield better results and greater returns on investment.

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