Its up to you, I wait until they are growing happily in their new media if I transplant and then 1/2 the size I want them to be at harvest. I think SOGgers flip within a week or 2. Someone said last week they dont multitask very well so I dont root and flower at the same time unless I am trying to see signs of what sex it is and I go back to 18/6 as soon as I do