My lady is about 4 weeks into the flowering stage and some of her leaves are starting to turn yellow. the yellowing is starting from the edges and working toward the center. Any advice and what could be causing my problem? Using Dyna Gro bloom ppm are at 560. I just added something new about a week a go. my lady wasn't under no stress when i added the gravity. is this stress or just normal for this time during the cycle?:your plant is growing and has N-deficiency which needs some extra Nitrogen when stretching during flowering. after it stops growing slow down on the Nitrogen and go back to normal nutes..