Mycorrhizae

i haven t , and i use all time a half spoon Micorizia in 1L in whater , no ever a prob.

If your medium is dead and you put a lot of mykos they probably go steal the sugar from your plants , if u add some molasses i think u will never have problems, unless u use mikos like substrate

no i can not see using to much, i wouldnt over do it though, i would follow the directions, they are there for a reason, now i could say there would be problems if you did not water. since water breaks down the mykos you could not use too much now if you put the plant directly in to a pot full then you would prob. get nutrient burn, and in turn use too much. hope that helps