Brown/orange spots, yellowing, purple stems, week 6 flower

Hey all. I have a plant mid-way through week 6 of flower, Panama Pupil V3 from Mass Medical Strains. Growing in Kind Soil +FFOF, only calmag and real growers recharge with ro water. Under 600w HLG QB132's even split 3000K/4000K spectrum.

I've been seeing brown/orange spots on older leaves with yellowing around them the last week and a half or so, and it's had deep purple stems for a couple weeks at least. I checked PH and runoff is showing 7, I tend to ph water between 6-7, but lately 6.5-6.8. Doesn't seem PH is an issue. If I have to ph, I use citric acid or potassium bicarbonate.

Been giving it 2ml calmag from true plant science every other watering through its life, but doubled the dose and doubled the frequency lately thinking this was a calcium deficiency.

I heard LEDs can cause calcium lockout due to the leaf temperature not getting warm enough (Mass Medical Strains podcast) so I lowered the lights and let temps hover around 80-82, humidity in the low to mid 40s.

Those don't seem to be helping. Every day the issue progresses, though slowly. I'm guessing I'm about 3 weeks out from harvest maybe (?), and I know this is when a lot of bulk gets put on. Worried my harvest will seriously suffer if I don't figure this out. I have 2 other plants that aren't quite as big, neither are showing the same issue. All 3 have received nearly identical everything except lately, where the PPv3 has been getting extra calmag and 5 quarts every 2 days. The other two get 2ml calmag and 3-4 quarts every 2-3 days. The big one feels so top-heavy after 2 days, it's crazy! =P

Images of affected leaves:

week 6 of flower yourr all good man.
weed plants wont look picture perfect their whole life. on the whole plant looks healthy and in a few weeks you can finish up with plain water .looks a bit cal def but also looks a little overfed , not really bad but you could prob back off on the nutes. may be a lockout or just a surge in demand for cal. either way its really minor. looks fine

puffdatchronic said:

week 6 of flower yourr all good man.
weed plants wont look picture perfect their whole life. on the whole plant looks healthy and in a few weeks you can finish up with plain water .looks a bit cal def but also looks a little overfed , not really bad but you could prob back off on the nutes. may be a lockout or just a surge in demand for cal. either way its really minor. looks fine

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Okay, that makes sense. Thanks for helping my anxiety about it lol. I haven't been giving any nutrients except the calmag and beneficials innoculant, so I had figured the living soil was out of juice. But I guess if the tips still look burnt, that's probably not it.

What ppm would you say the calmag should be at right now? I tried to get it to 120ppm once, but it took 5x the suggested dose on the bottle to get there (10ml). Only fed at that level once, then backed down to 4ml every feeding. All other nutrients are coming from the soil.

If it's not going to effect yields much, then I won't worry about it. I just thought these last few weeks were critical.

well if your growing soil you can drop the cal mag now . i find they only need it for the first 4 or 5 weeks 1212 .
not a hydro grower so if youre hydro idk

just looking again. the spots look more rust colour than cal def. id say you are possibly looking at lockout or overfeed. burnt tips is just one manifestation , you can get burns all over the leaf in advanced cases

They're in soil. I'll drop the calmag and see how they do. Thanks again!

Idk how she could be over fed, I haven't given her any nutrients. I'll have to check soil ph again. =/

yeah back off on the nutes. are you feeding every water?
ive found you can only get away with that until shortly after the stretching had stopped. then you have to back off to a feed feed water type pattern or something similar

technoHippieGuy said:

Idk how she could be over fed, I haven't given her any nutrients. I'll have to check soil ph again. =/

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now im confused, you said you were giving cal.mag?

I haven't been giving any nutrients except Cal-Mag. It's all in the soil. Kind soil is a super soil. Takes a plant from seed to harvest when used according to their instructions.

But yeah, the calmag I've been giving every feeding because I thought it had a deficiency.

ok yeah gotcha..yeah thats become more clear. cal mag overload. no more cal mag!
they only need it during the stretch.
google it , dont quote me on it but i think i read too much cal mag can cause lock outs. which would explain your rust spots.

but dont sweat your far enough along you will get tbere

Lol, crap, I've been trying to solve the problem by making it worse. Meh... And I just watered again today =/

Alrighty, looks like it's back to water only. Thank you again!

np gl