if the tips are yellowing and becoming dry and withered(dead) then your problem is over watering/salt build up try flushing and begin feeding with half the dosage of ferts u currently use
BkSkillz Reviewed by BkSkillz on . White widow first grow Hi, this is my first attempt at a serious grow. I tried when I was in college on my windowsil but it kinda failed, so a couple of weeks ago I invested in a 250w metal halide lamp. They seem to be growing ok, from what I can tell. However, the plants are starting to show a little yellowing on the leaves. I looked about and diagnosed this my self as a N deficiancy, so a few days ago I added some to the soil. It hasn't made much of a dif. They're not that yellow yet, I would just like to catch Rating: 5