I don't know if this is true, but I notice stems turning purple, then shortly after, leaves starting to yellow in first couple weeks of flower. Is the change from green to purple a sign of not enough nutrients? I thought it was the plants way of saying I need more nutes, especially nitrogen. So when I bumped up the nutes the yellowing progression stopped. The flowers r still filling out quickly with much vigor but I wanted to know if this is something I can gauge on how much to feed in flowering. I know there r exceptions to this because of strains, but have other growers noticed this and is it accurate. I took a video but can't post it without a youtube account. Anyway they r doing fine now, the tea was about 400 ppm then I went to 600 then 800 over the course of about 9-10 days. There r a lot of strains in the room and some needed more then others. Well happy growing guys, I'm not really looking for a diagnosis of the plants, hence no info as this thread request just if the theory holds water. Thanks again!