M3 - We have tested it for and with our grow classes.
We figure its about a 2 month feed; Thus it takes some getting adjusted to using the product, as with most all organic soils. Layering and topping off the pots with fresh soil seems to correct some of the lags around the end of the second month. M3 supplies (dont quote me, it may be a seperate company) a fert with the same ingredients as are in the soil called "Papa's Perfect Poo". (avialable in some stores; Mighty Grow in Jackson County MI is one that I am aware of) It can also be used to correct deficiency. Some strains (skunks as we have seen) "gas out" this soil sooner than others. We have learned that a month and a half veg works well, then we transplant into a final container with fresh m3 soil and then give a week longer in veg with the new soil before flowering, seems to work quite well. Our plants fade around the 5th week or so, showing N deff first (yellowing from the bottom up). Subcool of TGA calls this "the fade", and as organic gardeners we understand this to be a good thing and similar to a natural fall season change or for nute users "flushing".
We have had the final product (bud) tested at a two labs here in MI, and the Vortex came back with 21%THC and 4% CBD, tested lower in Super Soil...? Both passed with flying colors as far as organics go however, there was a comment left that the vortex could have been flushed a week longer... Considering there is no flushing being done and water is used only, its likely that the transplant from vegg to new soil for flowering, could have been done a week later allowing the plant to strip some of what was left in the first pot.
We just did an outdoor project were we made Subcools Super Soil out of M3. (the recipie calls for 8 bags of quality soil.)
We understand that it may be a bit potent, so layering was done and the bottom of each hole is the "super M3 mix" the middle is a 50/50 and the top is all m3. The plants went in a few weeks ago and I was down there to check on them and I have to say.... HOLY WOW!!!
BTW, a 3' x 3' hole at 2' deep took about 8 bags of M3 soil.
I will post images soon, stay tuned.
Woodsmantoker~