If I remember correctly.....the bloom and micro parts of the gh series have a N in them, so you aren't starving the plant for it by taking out the grow part....... It just happened for me, that I ran out of that bottle at a bad time so I just used the other two and it tasted better in the end so I kept doing it....... I think their formula is 5ml grow, 10 ml micro and 15 ml bloom/gal for blooming, but I might be wrong....the ratio is right, but not sure on amount...2Tbs/gal seems pretty high to me.......I tend to stay on the light side and found a post on the old OG that recommended the 4ml M,8ml B.....as I said, I liked it. The one beauty of GH flora is that you can manipulate the formula to suit you........
Ok, it was bugging me so I looked it up. GH Flora series Grow is 2-1-6, micro is 5-0-1 and bllom is 0-5-4........I should have more correctly said take out the gro part when flowering......the micro has more N than the gro anyway.... I agree taking out all the N would be bad......so accept the criticism for lack of clarity. For GH flora only, I would drop the Gro portion during flowering....for me it produced a less harsh, tastier bud....with no difference in yield.....
I don't use GH anymore, but it certainly isn't because it doesn't work well. Part is because I get too buzzed and forget how much of what I already put where....operator error....and the other is because back then there were only a few shops and it always seemed the part you needed most was out of stock.....most generally Bloom....our favorite.....