@Moe.Red @Aqua Man @GNick55
I really appreciate all your help. Sorry for the delayed response, I've been away and will upload pics tonight when I get home.
I don't think it's septoria, which was an early assumption of mine as well, but septoria is often quite contagious from what I've heard and the other plant in the tent which has been brushing against this one has no issue. Average VPD is floating right around 1, as I stated earlier.
I know yall were leaning toward watering issue, but I have to say I really am quite efficient with watering and have always had a good feel for when the soil is dry enough to need water but the plant hasn't started drooping yet, this is usually about every 3 days, and post transplant if the pot is larger, I will only water lightly and slowly graduate each watering toward the periphery of the pot, as to not have the plant sitting in soggy soil with more water than it can uptake.
I think it's stress related, and I'll go into some detail of the external factors that I altered this grow vs. others. I have a small 2x2 tent and growing has been just a nice side hobby, I do frequently alter variables from grow to grow because it's more of an experiment to me, I like to see what works vs what doesn't. Sometimes there isn't the 'if it ain't broke don't fix it' mentality, but it would be less interesting running on repeat over and over.
Anyway, here are variables that changed:
I usually go from solo cup straight to whatever pot I will finish in, either 3 or 5 gal. This run I wanted to try intermediate 1 gal pots.
Usually post transplant I will just place the light at the top of the tent and turn up the intensity. This time I slowly raised the light, keeping it about 25 inches from top of canopy but keeping the intensity lower (25% started and was at about 50% when this issue started. The rationale for this is I wanted to leave more wiggle room to turn the light up a few weeks into flower, rather than having the plants enter flower with the light already 100%)
Less nutrients -- I use foxfarms line of nutes and usually get a little trigger happy, nothing overboard but the tips of leaves during veg will usually have darkened (only the tippy top of the tips) and so I was trying to avoid this entirely and held off nutes. Once this issue started, PPM of runoff was about 650 and so I thought maybe I was under feeding. I did a small dose of fox farm big bloom (5ml/gal) and cal mag (5ml/gal) -- I initially thought it was a cal or mag issue and so repeated cal mag for another watering, issue just got worse. I also usually water until a fair amount of runoff so I can measure, but haven't this run because I wanted to see if holding the amended nutes in soil longer would be of benefit.
This plant that is having issues was growing very vigorously, almost doubling the size of the other and so I topped it twice, about 15 days apart. I think this was the real stressor and the root of the issue because shortly after 2nd top is when it all went downhill. But can stress alone cause this odd issues that pose as nutrient deficiencies? I really didn't know what to do to help it, so what I've done is transplanted it into the 5 gal pot (I know more stress, but at this point it was outgrowing the 1gal and I wanted the roots to grow into new soil hoping it would correct any nute imbalance. The plant would have died in the 1 gal so figured I had nothing to lose).
www.thcfarmer.com
