I'm using it in my first grow, but sorta as a supplement. I didn't get everything set up as I intended on my first grow. Covid bit me in the butt on availability of somethings I intended to use and a racoon raped my worm bin. LOL! Since I'm in the boonies, I have a trip planned next week to get replacement adult worms for my pots and other supplies I intend to use.@WildBill have you tried MegaCrop? I did not even have to use calmag. I love it
I have a friend that uses MegaCrop commercially in his non-canna program. It's fantastic. Since it really doesn't harm microbes at the prescribed levels, I have no problem using it in my program.