Good morning, There are a lot of strains that have a purple or red stem. G-13 is one that I just harvested and her stalks and stems were purple from the get go. What strain is she?
Red stems means she is healthy. It means that the water and nutes are being delivered just fine throughout the plant. The plant in the pics looks just great.
Stop watering the leaves. Plants don't intake water from their leaves, they do it from their roots. You're promoting mold and insects.