What species of mychorrhizal fungi did you get? According to what I've read on this and other forums, there are apparently only two endomycorrhizal fungi that form a beneficial symbiotic association with Cannabis: (1) Glomus intraradices (aka Rhizophagus intraradices or Rhizaphagus irregularis) and (2) Glomus mosseae (which has also recently been reclassified and renamed). If you are using a granular form, the best method of application if it is still possible (e.g., up-potting or transplanting), is to sprinkle the granules on the root ball/root system of the seedling or clone plant as well as sprinkling the sides and bottom of the planting hole into which you will be inserting the plant. If the plant is already well rooted and established in its growing container, it has been suggested that you poke several holes around the roots of the plant and sprinkle the granules into the holes, cover up the holes, and water in. Some of these mycorrhizae products are also made as wettable powders, in which case you can simply mix the mycorr. powder with non-chlorinated water (also non-chloramine water) and water in the powdered mixtsure solution around your plants. Additionally, I have recently learned from an article in the Journal of International Experimental Botany that combining the bacterium Azospirillum brasilense (
Azos) with Glomus intraradices (aka Rhizophagus intraradices, aka Rhizophagus irregularis) results in increased growth and yield. Using these two products by combining them when applied should effect best results.
If you are planting seeds, you could first roll the dampened seeds in mycorr. powder (or mycorr-
azoz powder mix) before putting the seeds into the growing medium. If you are putting seeds into plugs like root riot, you could sprinkle mycorr. granules or powder in the hole of the plug where the seed will rest, then afterwards, when the seed has germinated and is ready to go into a larger container, you could sprinkle the outside of the dampened rooting plug with mycorr. granules or powder before placing the rooting plug into the planting hole in the container pot. You could also sprinkle or powder the planting hole into which you will place the root plug with more mycorr. product.
I am a newbie and have gathered this information from contributors to this and other forums as well as reading research papers and science articles on the subject. I am learning and welcome all viewpoints and opinions, especially from experienced growers.