Dont take my word for it, but it might be calcium or mg lockup. I think i have the same problem. Add epsom salt, and make sure ph is in the right range.One of my plants has some dry yellow spots on some of the lower leaves, I have been trimming the more affected ones off (3-4 leaves.) And it is drooping significantly and seems to have a dark color, though it is still growing an inch or more per day. I am attaching pictures, thanks for the help people.
Peace & Love.
It is probably due to the ph. Make it lower than neutral, you want 5.3 to 6.5 PH. You can add epsom salt, do it if the problem consists with the ph in the appropriate level.Tested Ph of water that I have been using.... It was around 7.8-8.2 wayyy too high, should have thought of that. I equalized it to a 6.8-7.0 figuring neutral would be best. Flushed the affected plant. Hopefully it helps. Is calcium magnesium lockup caused by that, do I still need to add epsom? And how much for a plant that is in the first week of flowering watering about 100-200 mL every other day?
Thanks, Peace & Love.