Grow after 4 years

There's a couple of other less likely possibilities. One is that your plant might be getting too much or too little water. Another is that the soil might be too acidic or alkaline. Finally, it could be a sign that your plant is getting too much light. If you've already checked for the more common problems, like nutrient deficiencies or pests, then you might want to take a closer look at those other things I just mentioned. Next time you water check the ph of the run off water if it's not in a good zone then flush soil with water ph 6.4

There could be a few things going on with your cannabis plant. Nutrient deficiencies, especially with things like nitrogen, magnesium, or potassium, can cause yellowing on the leaf tips. Over-fertilizing can also cause a similar reaction, so that's something to look into. If you're using well water, there might be chlorine or fluoride in it that could be harming your plant. And finally, pests like spider mites can cause yellowing, so take a close look to see if you find any tiny bugs on the undersides of the leaves.

overfed if u've fed it