Growing and Cultivation

Improve yield and quality of your cannabis crop with the help of Mycorrhizae — Ed Rosenthal

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Understanding Mycorrhizae

The earliest evidence of this plant-fungal symbiosis dates back 407 million years and is known as mycorrhiza, which in Latin literally translates to fungus root (myco = fungus and rhiza = root ).

 There are five types of mycorrhizal fungi on the planet that are currently known to scientists. Each plays a key role in nature, associating with only specific plants at times and at others with a wide array of plants. Only one is beneficial to cannabis and that is the arbuscular mycorrhizal fungi (AMF) and within this category even fewer actually associate with cannabis.

AMF is the most common of all fungi and is associated with approximately 90% of all plants on earth. These fungi literally penetrate cell roots and create a network within the root and outside of it. The fungus creates a branching structure, an arbuscule, within the plant cell where carbohydrates from photosynthesis are exchanged for nutrients, water, and minerals brought by the fungi. These fungi do not produce any fruiting bodies and reproduce asexually below ground. 

This symbiotic relationship is fairly simple. The plant supplies the fungi with carbohydrates and in return, the fungus provides the plant with the necessary nutrients it needs. The more the plant needs nutrients the more carbohydrates it will send down to the fungi. With cannabis plants, this exchange is done inside the cell root in the arbuscules.

 

Cannabis Co-Evolved With Fungi

Before the legal changes that began in 1996, most cannabis cultivation was done indoors and away from the eyes of neighbors (unless you were in Humboldt county). Growers relied heavily on technological advances in lighting, ventilation, and various hydroponics systems.

Growing was done indoors and not out in the open; growers relied on bagged growing media for their substrate. The majority of packaged growing media arrives at our doorstep after being sterilized. “Kill off all the bad guys along with the good guys and feed the plants the essential NPK and a few other microelements and you’ll be good” was the approach that many growers used. There’s been a shift in thought over recent years and many growers are now leaning towards a living soil method by using the soil food web and taking advantage of the various microbes in the soil. As Jeff Lowenfels’ books suggest, we need to be “Teaming with Fungi” and “Teaming with Microbes” and the reason is simple. Nature knows what to do best. Mimic it and you’ll get promising returns.

When cannabis was illegal, no real scientific studies and trials were done on the efficacy of the growing techniques and methods in terms of what affects the plants and the phytochemicals, terpenes, cannabinoids, and flavonoids. With the advances of science and the fact that cannabis is now legal in many states, more and more growers have the opportunity to dive into real scientific research. One of these fields of research is the soil science aspect and the delicate interaction between plants and the soil microbes in which the plants grow.

The Benefits of Mycorrhizal Associations

There are many benefits of utilizing fungi in your cannabis garden. Firstly, a larger root surface allows the plant to absorb nutrients, minerals, and water from a greater area. In nature, the mycelial network can extend for miles and connect between multiple plant species! A larger root surface area will help in many things, amongst them is transplant shock and death rates which are much lower when mycorrhizae are present compared to when there is no symbiosis.

Secondly, there is increased nutrient uptake. With an increased surface area, plants can now absorb more nutrients and water than without the mycorrhizal association. This means reduced fertilizer inputs and higher yields. In addition, the AMF not only helps with the basic NPK but also with the absorption of microelements such as iron, zinc, and manganese.  

Other benefits include Increased phosphorous absorption. Mycorrhizal fungi secrete unique enzymes that free up phosphorous molecules and transport them to the plants in an available form. This is especially beneficial since roughly 85% of phosphorous in the soil is unavailable for plants. Once it’s flower time and fertilizing program changes, nitrogen levels go down and phosphorous levels go up in order to increase the size of the buds. With the help of mycorrhizae, the plants will already be enjoying increased phosphorus levels compared to non-inoculated plants.

Using fungi also creates a living rhizosphere. Life brings life, it’s as simple as that. When adding a biological element to a growing operation it tends to create more life. The addition of mycorrhizae will help other microbes thrive, for instance, bacteria. The hyphae literally create a superhighway for the bacteria to move around on. These bacteria also play pivotal roles, from nitrogen fixation all the way to plant protection. This living rhizosphere creates a new ecosystem where all the organisms benefit from the presence of one another and help each other compared to a lifeless inert media with only synthetic inputs added.

Fungi can also serve as a defense mechanism. With the help of this hyphal network surrounding the roots, plant pathogens have a much harder time attacking the plant. Research has shown that mycorrhizal fungi can help combat certain soil-borne pathogens, amongst them are Fusarium, Pythium, parasitic nematodes, and others.

Plants with a mycorrhizal association have a higher stress tolerance because the presence of the fungi lowers the salinity (EC) of the soil and therefore affects the pH and EC levels making the soil more suitable for plants to live in. In addition, the plants are more drought-tolerant because mycorrhizal plants are able to “reach” larger distances in search of water. The hyphae extend well beyond the rhizosphere and spread out into areas that plant roots can’t access. 

Finally, mycorrhiza also produces glomalin, which is a glue-like component secreted by the fungi that help bind soil particles together to prevent soil erosion as well as improve soil stability. Scientists are seeing a correlation between the presence of glomalin and the primary productivity of an ecosystem. It is the foundation of all ecosystems so to speak and the absence of fungi will create an imbalance in the entire ecological system. If you are attempting to grow in a no-till, regenerative approach, mycorrhizal fungi should be the first thing to add to your garden. 

Application of Mycorrhizal Fungi

 There are several ways to introduce mycorrhizal fungi to your grow operation. The earlier in the plant’s life the better, the simpler the application and the higher chance for successful inoculation. The younger the plant is, the greater the impact of mycorrhiza. As the plant matures, the tougher it is to guarantee inoculation. The older the roots are, the more they thicken and harden, making it difficult for the fungi to penetrate. Since the fungi must reach young, penetrable roots that are found at the bottom of the pot or at a greater distance from the stem, the application is more complex and the impact much lower than with young plants. Below are several of the application methods we recommend using.

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