I always give my plants P and K during flowering. The plant will use more in the first 2wks and again for 5 days 3wks before harvest so most PK boosters are to be given for 2wks from wk 4 with an 8wk flowering plant as its hard to hit those 5 days. I think BioBizz do Top Max which is a PK booster. Your buds will get much fatter. Check out the biobizz site.
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