@Ripper I was following the feeding schedule on megacrop web site. Only problem I have seen is when I feed 6 grams/gal for a sour stomper @ around 48 days ..only time I seen slight nute burn ,I dropped back down to 5g/gal..it stopped. I am sure with big photos it would be fine. I also feed seedlings 1g/gal with no ill effects with gradually increase per week.