Yes… I spray it on as a weekly wash now to prevent any problems also.
Spray it on top of your soil, and it washes in when you water your plants… It does not kill your beneficial fungus.
Be sure to water your plants to runoff 1 hour before you use the spray to totally hydrate your plants, and turn your lights to 50%, or do it before sleep time… He states to do this on his website.
Here’s my grow journal…