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While I agree that they look hungry, a lot of strains have yellowing leaves during flowering... but usually later than 5 weeks of flowering. The last photos almost look like a lockout or overdosage of P or K. What are they being grown in and what kind of feeding regimen are you using? They don't look too bad, but they shouldn't be turning colors yet.
I agree with Jim, it looks like a lock out; what's your medium what are you feeding, pH, PPM?? More info will get you a better answer, good luck
Distilled water and I'm guessing RO water do not have the pH that you think they can't be accurately measured by the type meters we use because there aren't enough ions in the water from what I've learned and if you check it after a little while that 7.0 drops to 5/8, also 7.0 is too high anyway for foxfarm, 6.5 is bestI am growing in Fox Farm Ocean Farm.
I have been top-dressing during flower using Roots Organics Terp Tea/Uprising Bloom/Uprising Foundation based on the feeding guide from their website.
I also have been using Herculean Harvest from Nectar of the Gods as a supplement on certain days with Recharge. The Water I am using is all RO water at a PH of 7, since I have been top-dressing mainly I havent had to take a PPM reading on the water.
Maybe too much Herc Harvest? Whats the best way to recover prior to harvest time?
It looks to be entering the final part of flowering... how long has it been in flower? Often, the larger fan leaves will yellow and die off during the lst weeks of flowering. They also can change color. Unless you have a deficiency and it is causing the leaves to turn yellow early, although at later flowering, it is common wisdom to go easy on the nitrogen to keep chlorophyll levels to a minimum. The lighting makes it hard to tell exactly what color the leaves are... they almost look lime green or lighter to me.
It's a matter of preference. I would give maybe a 10% feeding, just to keep them going a little until the end. Flavor really seems to develop in the later weeks and a small snack shouldn't really hurt anything. Some folks feed like crazy then try to flush out the plants, but I prefer to try to mimic nature, when nute levels drop off but don't totally disappear. Consider someone passing of old age... do you suddenly stop feeding them or do you feed them just a little to make them more comfortable? Plants aren't people, but they do seem to react to disruptions in their cycles.Saturday will be 7 weeks of flower. Per Greenpoint Seeds they suggest a 9-11 week window.
You are correct that one or two plants look more lime green. One seems to be a nice healthy green but the buds are not nearly as thick as the others and it droops more than the others.
I am debating just giving straight RO water going forward since it's just about 2 weeks of flower left. What do you think?
So just your opinion as well as anyone else's would be interesting, the only droopy one I have in the latest pictures is annoying, do you think under/oberwat
it's not underwatered. which is by itself, not an answer.
overwatered? maybe more perlite next time in that FF mix?
what's the temps & humidity like?
you're close to harvest, now.
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