Veronica is right on the money here. I have read Monika's studies years ago and have tried to go by her guidelines with good success. I could not count the times that I have posted that people should stop using bloom booster. Some say, I only use it just before the Brus bloom but even then Brugs don't like it. I compost so much now, that I do not feed anymore. The Brugs I grow in pots I use Osmocote 19-6-12