The NZ-made CO₂ Grow Bag is a simple, eco-friendly solution for enriching indoor grow tents and small greenhouses with carbon dioxide. By naturally increasing CO₂ levels these bags can boost plant growth and yield by 20–40% or more. Ideal for microgreens, herbs, and flowering plants, the bag uses mushroom mycelium to release CO₂ steadily over several months.
Easy to use and cost-effective, it’s perfect for growers seeking healthier, faster, and more vigorous plants without complex equipment.
Benefits:
Improve plant growth and yield
Easy to use
Long-lasting
Suitable for small spaces
Can be used with a variety of plants
Safe and eco-friendly
Cost-effective
Co2 Bag in-depth user guide here
A single XL size CO² Grow Bag is designed to cater for a 1.2x1.2 growing space. Grow spaces with dense heavy foliage can easily take multiple bags.
Dual Large size CO² Grow Bags match the same size environment.
For larger spaces simply increase the number of bags relative to the size of your growing environment.
A number of our customers do use many more bags in the same size environment - but we’d recommend you use a CO² sensor to check that you are in the optimal range of 600-1200ppm when you do so - and adjust ventilation accordingly.
Note: Many factors affect the CO² requirements of your specific growing environment - how much fresh airflow you run, how many plants you have, size of plants, stage of growth of plants, light intensity, style of growing system etc - therefore this is just a basic rule of thumb guideline.
Product Life-cycle
CO² Grow bags will last for approximately 4-6 months as the mushroom mycelium breaks down the carbon-producing mix in the bag. CO² production mostly stops after 8-9 months.
Frequently Asked Questions
How does the CO₂ Grow Bag work?
It uses mushroom mycelium to break down organic material, releasing CO₂ naturally.
Is it safe for all plants?
Yes, all plants benefit from increased CO₂ levels.
How long does it last?
Typically 4–6 months, with reduced output up to 8–9 months.
How do I set up my CO2 Bags?
To Activate your bag peel off the sticker on the front so the white filter is exposed (Do not remove the white filter patch).
Do I need to do anything to maintain the bag?
No, your CO2 grow bag comes ready to go - it does not require any maintenance.
Why has the colour of the grow bag changed from white to yellow/orange?
As CO² Grow bags advance in age, the mycelium in the mushroom substate inside the bag will also age, harden, and change colour.
Orange to yellowish colours are normal as the block ages.
If your bag has gone green it has been contaminated with Trichoderma (green mould). This is a very rare occurrence which affects the odd CO² Grow bag. Usually bags will only go green if they are pierced or overheated. If your bag is less than a month old and has gone green it should be returned for a free replacement under our 30 day Guarantee.
Note: Trichoderma is harmless to plants and is an important part of healthy soil structure, however it will kill mushrooms fighting for the food inside the CO² bag.
What is the liquid forming inside of the CO2 Bag?
Mushrooms are water lovers. The contents of your CO² Grow bag are a hydrated carbon-material-mix containing water + mushroom mycelium. As the mushroom mycelium breaks down the material inside the bag - converting it to CO² - a clear-to-yellow liquid will pool inside the bag as a by-product. This is a natural, healthy, harmless liquid that does not need to be drained.
If your bag does leak, you can simply wipe it up or leave it to naturally evaporate/ soak into the soil.
It is best to keep the bag sealed so moisture does not evaporate out of the bag too quickly.
If holes are made in the bag the water in the carbon mix will evaporate and CO² production could stop prematurely. If you do accidentally put a hole in one of your bags simply seal it with some plastic tape or duct tape.
What should I do if I accidentally tore open or punctured my CO2 Bag?
If you do accidentally puncture your bag simply tape it up using plastic tape or duct tape.
Will my CO2 Bag produce mushrooms?
It's important to keep the bag sealed so mushrooms do not grow outside of the bag.
Inside the bag, as it ages and the mushroom mycelium grows upward, you will get some white hard growth on top of the white block. However, as long as the bag is kept sealed mushrooms will not grow outside of the bag.
How should I Dispose of my CO2 bag after use?
Once the bags have done their dash the contents can be easily composted. Cut the bag open and add the contents to your compost pile or garden. They will finish breaking down there naturally - turning into great organic soil.
You can also spread the contents on top of soil in the vege garden. This will help feed soil organisms and build soils.
Please dispose of plastic bag in the rubbish bin, they are not recyclable.
Do I need to worry about any chance of introducing pests or disease to my growing environment from co2 bags?
No, the contents of your CO² Grow bag are 100% steam-sterilised during the manufacturing process -- so there is no chance of introducing harmful bugs, pests or diseases to the growing environment.
Furthermore, the mushroom culture used inside your CO² Grow bag is entirely harmless to plants. It is a saprotrophic mushroom - an organism that only feeds on non-living matter at a microscopic level. Even if your CO² Grow bag were left open in your growing environment it could not eat your plants.
In the very rare case of a CO² Grow bag becoming contaminated with trichoderma (green mould), only the CO² producing mycelium within the bag is adversely affected. Trichoderma is, likewise, entirely harmless to plants.
