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Mycorrhiza: The Ultimate Beneficial Microbe For Growing Medical Marijuana

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Medical marijuana growers are the driving force behind many advancements in agriculture. Of course, the USDA isn’t going to start patting any of us on the back, but it should be noted that many innovative agricultural techniques originally stemmed from testing done by indoor horticulturalists. The use of beneficial mycorrhizae is a good example. There has been a surge in the agricultural use of beneficial organisms that has stemmed from the innovation of medical marijuana growers. Years before commercial farmers had even heard of mycorrhizae, there were medical marijuana growers implementing these beneficial organisms into their gardens.


Growing Cannabis With Mycorrhizae


Mycorrhizae are soil organisms that have a close, symbiotic relationship with the plant’s rhizosphere. The word “mycorrhizae” actually stems from the latin words mycor (fungus) and rhiza (root). The mycorrhizae and roots form a sort of tissue that enlarges the surface absorption area of the roots by 100 to 1000 times. Mycorrhizae create thousands of tiny filaments or threads that act like an extension of the root system. This not only increases the plant’s ability to uptake water but also the ability to uptake vital nutrients.


Medical marijuana plants with supplemented mycorrhizae will never be “held up” by the inability to uptake nutrients. This is very important for indoor horticulturalists that spend vast sums of money on high powered lighting and CO2 enrichment designed to maximize photosynthesis. Mycorrhizae also increase resistance to environmental stresses like drought or cold and reduce shock associated with transplanting. Supplemented mycorrhizae will increase a plant’s efficiency and may even require a reduction in fertilizer concentrations.


There are millions of different mycorrhizae strains, some of which are specific to a given crop. That is one reason I use Piranha by Advanced Nutrients. Advanced Nutrients specifically tests all their beneficial microbes on medical marijuana. The strains used in Piranha are the strains found to be most specific to our particular crop.


Two Types of Mycorrhizal


Mycorrhizae used in horticulture are usually broken into two categories: Endomycorrhizae and Ectomycorrhizae. Both of these subcategories of mycorrhizae are beneficial to plants. This is why you will find both varieties in most mycorrhizae formulas on the market.


Endomycorrhizae are mycorrhizae whose hyphae actually enter the plant’s cells. The hyphae do not penetrate the protoplast but instead turn the cell membrane inside out. This increases the contact surface area between the hypha and the cell cytoplasm which facilitates the transfer of nutrients.


Ectomycorrhizae form between the roots and do not generally enter the plant’s cells. Ectomycorrhizae create a hyphal sheath around the root tip and also a hartig net of hyphae that surround plant cells found within the root cortex. Outside of the root the fungal mycelium forms an extensive network throughout the soil or medium.




These tiny workhorses are an essential part of any medical marijuana garden. The more we understand about the supplementation of beneficial organisms, the more we can supercharge the rest of our garden to maximize performance. High intensity lighting, quality nutrients, and desirable atmospheric conditions teamed with the unseen world of beneficial microbes can make lush growth and bountiful yields commonplace in any medical marijuana garden.



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Mycorrhizal fungi have existed since the first plants appeared on dry land more than 450 million years ago, so id say their pretty vital to plant heath. I brew organic tea with worm castings and some great white and molasses to feed the mycros.. i think their harder to kill then people let on. I feed the tea three times during my plants lives, once after transplanting, once during week 1 of flowering and once in week 2,, then every once in a while i mix some molasses in with my nuts... I know they thrive because a foam forms on my runoff as it gets oxygenated going down the drains in my trays.

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Spores are not water soluble.  Myco is spores.  Myco is not water soluble.  You would need to crush the spores to make them water soluble, but then they wouldn't be spores anymore so.....


You are wasting money if you are putting myco in water.  It is best used at transplant, sprinkled dry on the root ball and/or transplant hole.


"Chem " nutes don't kill myco, high levels of P will inhibit it.  Trichoderma will also inhibit myco.


All mycorrzial spores come from one manufacturer.  They are then diluted, repackaged, sometimes mixed with other things (often so much trichoderma that the myco is unable to survive) and sold for a profit by everyone in the world who sells myco. 

Edited by Petyr
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mycogrow-soluble's small particle size makes it ideal for use in hydroponic growing units as well as standard nursery, garden, and potting applications.

That is what I am using in my teas (for my hydro system)., It is AMAZING! I just use a handful of ancient forest in a sock ,feed in into a 5 gallon bucket filled with r/o water with an airstone give it a scoop of molasses (unsulphered), and 2 days later you have a miracle.

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The tea has to be refrigerated, and even then it is only good for about 10 days. Do your homework on this one. It is very important that you replace the life in the water by adding more tea every few days, and many many things can kill the little guys too.


They also need a place to colonize other than the roots, sometimes they like to live on airstones, some people will put a little raft or sponge for them in the rez.

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