Seems to reason that because she has no food in the substrate that she would begin drawing N from the existing foliage. Just figuring here as I have only grow from cuttings. I know peat can creat some PH issues as well. Did you buffer your medium at all?
CaliJay Reviewed by CaliJay on . White Widow seedling trouble My white widow seedling is about two weeks old now. She has three sets of true leaves and is working on her fourth. She is growing under cool florecent lights at 75 degrees. Her medium is 25% peatmoss 25% topsoil and 50% perlite. Since she is still a seedling and still has her bean leaves, I have not given her any ferts. I have just given her water (pH 6.7) Here is the trouble. I noticed her leaf tips begining to yellow. ALL her leaf tips. They are not burnt. There are no burn spots anywhere on Rating: 5