chasv77answered grow question 5 years ago I think Mrs_Larimar meant 3-4 weeks. For example FoxFarm Ocean Forrest, has enough micro-nutrients to last for over 30 days, for most strains. I would not feed, until after this point. And when you do start feeding, start at 50% strength, then watch your babies to see if any weirdness starts to show up. If not and your feeding "ONLY" once a week to ten days, maybe go to 75% strength. But every strain I grew could not handle the 100% strength of the FoxFarm Nutes.