I got some plants that have a number of leaves that are yellowing rapidly. But the rest of the leaves look nice and green. Once a leave begins to yellow it happens pretty fast (a couple days) and become "soft" when breaking off. i.e. they don't "snap" off - they just feel kind of mussy when you remove them (albeit the leave itself is normally - just yellow). All different strains (and I can't remember what is what). This is an organic outdoor grow in FFOF, 15 gallon pots. Plants are about 3 months old in various states of flower. I'm having to water almost every day (even though it's not been that hot - mid 70's) as the plants begin to droop. Weather has been really cool, overcast until 10-11am. Then in the mid 70's with nights in the 50's. They've been getting fert tea about once a week with bat guano (10-2-1 during veg .5-12-.2 during flowering). The tea also has worm casting, fish hydrolysate (2-4-1), kelp (1-.1-2), and rock phosphate (0-2-0) & molasses. Recently I've been giving them straight guano (no team). I don't worry about the ph much, but when I did test run off it was right around 6.8 - 7.0. Have used Excel LG & Actinovate for PM (which I haven't had on the plants, but is around in the yard), neem, and a BT for the evil moth worms that like to do a number on the plants every year. The plants are in various stages of flower, with some flowering real early (a month ago). I understand the flowering plants having yellow leaves. But the one plant showing the most yellowing (First three pics) is just starting to flower. No purple color (anywhere) on this plant. Pics 4 & 5 are of another plant. This also shows yellow but much further along not abnormal. Last pic is a group shot of several plants.