What is air layering?

What is air layering?

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Air Layering Cannabis Plants: Boosting Propagation Success​

Air layering, a relatively ancient technique used by gardeners for centuries, has found its place in modern horticulture and proves beneficial in cultivating cannabis. This article delves into the science and practical steps of air layering as a propagation method for cannabis plants.

Understanding Air Layering in Cannabis Cultivation​

To comprehend air layering, it's essential to first understand what propagation entails. Propagation refers to the process of reproducing plants from the mother stock, which ensures the perpetuation of particular genetic lines. In cannabis cultivation, consistent quality and characteristics are paramount, making effective propagation techniques critical.

Air layering is a unique form of vegetative propagation that doesn't involve cutting the plant until the process is nearly complete. The technique encourages a plant to develop roots at a certain point along its stem while it's still attached to the parent plant. This method is a powerful tool, especially for mature cannabis plants that have grown too large for conventional cloning methods.

The Air Layering Process: A Step-by-Step Guide​

Venturing into air layering can be an exciting journey. Here's a comprehensive step-by-step guide to air layering your cannabis plants:

1. Select the Right Branch: Choose a healthy, mature branch on the cannabis plant that's at least a year old. The branch should be vigorous and disease-free.

2. Prepare Your Materials: Assemble the necessary materials for air layering: sphagnum moss, rooting hormone, a sharp knife, plastic wrap, ties (such as twist ties or elastic bands), and optional aluminum foil to block light.

3. Wound the Branch: About one-third down from the branch tip, carefully make an upward 45-degree cut halfway through the branch's width. This cut should be about 1 inch (2.5 cm) long. A smaller cut can be made below this incision to hold rooting hormone, which will facilitate root development.

4. Apply Rooting Hormone: Dust the exposed wound with rooting hormone to promote root growth. Avoid over-application, as too much hormone can damage the plant tissue.

5. Wrap With Sphagnum Moss: Moisten sphagnum moss and wrap it around the wounded section of the branch. Ensure it completely covers the cut and is thick enough to retain moisture and promote root growth.

6. Secure the Moss: Use plastic wrap to secure the sphagnum moss in place around the branch. The wrap should be snug but not overly tight, to allow for expansion as roots develop. Secure the ends with ties to create a sealed environment.

7. Encase in Aluminum Foil: For those desiring to block light, wrap aluminum foil around the plastic. This step is optional but can prevent algae growth and simulate underground conditions, promoting stronger root development.

8. Monitor the Air Layer: After the wrapping is secure, it's essential to monitor moisture levels. The moss should stay moist, not waterlogged or dry. Depending on the cannabis strain and environmental conditions, roots may take several weeks to develop. Patience is key.

9. Sever the Air Layer: Once a healthy root system is visible through the plastic, it's time to remove the air layer. With a sterile cutting tool, cut below the newly developed roots and gently remove the wrappings.

10. Plant the Air Layer: Transition the new plant to a suitable growing medium, treating it as you would a new clone. Maintain high humidity and gentle airflow to encourage acclimatization to its new environment.

The Perks of Air Layering​

Air layering is not just a fascinating horticultural practice; it has clear advantages in cannabis cultivation:

No Shock Transition: Since the new roots develop while still receiving nutrients and water from the parent plant, the transitioning clone experiences minimal shock when cut away.

Cloning Large Plants: Air layering allows for the propagation of larger branches that might not root well as typical cuttings due to their size.

Disease Resistance: A plant grown from air-layered cuttings typically has a well-established root system, making it more robust and potentially more resistant to diseases and pests.

Higher Yield Potential: Clones produced through air layering often have a more developed top growth, possibly leading to higher yields once transplanted and matured.

Potential Drawbacks and Considerations​

While beneficial, air layering does come with some considerations:

Time-Consuming: The process is slower than traditional cloning, requiring patience and attention to detail.

Learning Curve: It might take a few attempts to perfect the technique and understand the unique needs of the cannabis cultivar being propagated.

Space and Accessibility: The cannabis plant must have branches that are accessible and suitable for air layering, which might mean it's not feasible for all plants, especially those in confined spaces.

Legality and Ethical Considerations​

It's crucial to remain aware of the legalities surrounding cannabis cultivation, as laws can vary significantly by region or country. Always ensure you are compliant with local regulations when cultivating or propagating cannabis plants. Ethically, propagation should also respect the intellectual property rights of breeders who may have patents or breeders' rights over particular strains of cannabis.


Air layering represents an exciting and innovative way to create new cannabis plants with hearty root systems and robust health. While it may be more time-consuming than other methods, the potential benefits of stronger plants and higher yields are often worth the extra effort. The key to successful air layering lies in attention to detail, patience, and care for the plant. As always, make sure you're operating within the legal confines of your area and respecting the work of cannabis breeders. Happy growing!
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Great stuff. Thanks @logic
An understated method of 'pre rooting' clones...
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