Absolutely. Weed is resilient, and plants get much worse than this. Just get the ph under control and I think you'll be good. If ya can get recharge, I love it. I buy it from amazon. Its an amazing amendment, especially for new growers because it allows for a much wider ph range. I have had great success with ffof and recharge. I used to use nutes week 4-5 of flower, and I still do for certain strains at 1/4 strength during flower. But with many strains I don't even use nutes anymore. I use ffof with 1/3 mix perlite. Recharge every 3rd watering at recomended amount. Top dress once I start to see hungry signs, etc.