Not having looked at your picture of this "stressed out" leaf, I responded to you in PM in this way: I am not a fan of trimming leaves without a good reason. If a leaf is dried out to the point that it simply falls off when lightly moved, then I will remove it. This happens all the time and is not something to get alarmed about. We do drive these plants to their deaths after all, so there is going to be a little bit of a die off, especially at the end. That being said... There are many times that we trim a vegitaging plant to shape it. I will trim fan leaves that end up laying on the soil, and I will trim a lot of the growth that occurs on the inside of the bush and that will never reach the outside or the top of the canopy. Especially in the "inside" of the bush, you want good airflow and anything that isn't going to be able to get enough light to be productive should be removed. The lower 1/3 of my plants are stripped bare 3 days before going into flower so that all future effort will be to those branches that then form my canopy. I would never remove a leaf because it had become sick as result of something I am doing wrong with the plant. If the leaves are starting to show a specific symptom, I want to be able to track the problem's progress up the stalk or see that it is isolated to a particular area. I want to see the whole plant, and its entire way of presenting its distress to me. I want to keep the sickly leaves on the plant so that as I apply corrective measures I can clearly see if I am causing a healing effect. People get so offended by yellowing or signs of this or that deficiency, and I think because people like to take pictures of their gardens, they remove them. It may be good for the ego to do so, but it is silly for a gardener who wants to be able to communicate with his/her plants, and seen in that light it seems silly to remove the signs that the plant displays for you so as to be able to see the problem it is having. The plants can and do talk to you if you know how to look and understand. There is nothing as satisfying to see a once sickly and yellowing leaf repair itself and once again take on a healthy green because you knew exactly what the plant needed. Having said all that, I would like to make an observation and a comment. The comment is that "stressed out" is a human thing, and it is assuming that plants experience the same thing... such as being stressed because it is just so hard to be a lower leaf and all that... There is also stress because of deficiencies, or watering incorrectly. This stress should be recognized for what it is, and corrective measures taken so that this "stress" does not travel upwards to the rest of the plant. Instead of snipping the dying leaves, let's see if we can stop them from dying, or worse yet, having the problem that they are having move up the trunk to the next set of leaves. So what do I think is the problem? Your plants are very healthy and have only the very slightest magnesium deficiency. Those lower leaves are the largest storehouses of this vital element and they are always the first to show the signs of this deficiency. Add or increase CalMag+ or a similar product in your watering regime and see what happens. See if you can notice a change in those leaves 3 or 4 days after you have made this change. If you chop them off, you will never know if you plant actually needed that boost or not. Snipping them simply moves the problem up to the next set, and there you have no way to tell yet if it was indeed magnesium.