labifleanswered grow question 6y ago Hey gardener! So I was given a tip, I was told to add the PK halfway through flowering - the flush, which means if your flowering lasts 60 days and your flush is 10 days, you do 60-10 = 50 and then 50/2= 25, so that's when you add the PK 13 14. However, here you're using grow fertilizer while you need bloom fertilizer, so start switching to bloom now without hesitation. At worst, you can do half grow and half bloom for a smooth transition, and then follow my advice on the PK 13 14 but take it easy, like half dose at first and then a big dose later. Happy growing, your plants are beautiful, take care!