Pre flowering plants

Hi! They are already in flowering stage and this would probably be the first week. You can change to flowering nutes gradually by giving ½veg and ½flowering nutes the first two weeks and then change to full flowering nutes after the stretch is over and the plant is focusing on bud developement. Your girls still need nitrogen during the stretch so thats why you don't want to switch to flowerting nutes right away. What comes to LST, it depends what you want. I suggest that you slightly bend the highest colas to the level of the others and try to maintain even canopy to get as much horizontal space used as possible and focus on having one layer of tops rather than few donkey dicks. Even better if you can get the colas on the edges to grow little bit higher than the ones right under the lamp, to get even better light distribution