this one has me stumped. i see this since switching from GH to jacks. last time it happened, i reduced light, raised temps and dropped veg EC with the same formula and they took off like a rocket. these are small girls on the floor that were under a too-bright blurple light while i was building out a new cob rig.
these are GG4 from darkheart moms which were phenomenal just huge and healthy and super vigorous
symptoms:
lanky growth, purple stems, pale leaves. leaves (esp shoots) are really purple and their margins and twisted and contorted. it almost looks like when your tall girls grow up too close to the light and bleach and twist.
possible causes:
too cold (upper 60s to low 70s with LEDs)
EC too high
too much light
micronutrient deficiency or lockout?
salt shouldnt be an issue i water 2x day and have been on the softer side of EC lately, 1.0-1.2
they were healthy green albeit a bit lanky for their first few weeks under 2 foot t5. i thought they were ok to take more light but after a week under the blurple (solarstorm osram 880 on veg ~400W, 30-36" above the girls in a 3x3 tent) theyre not doing well
its like a deficiency but more like a lockout as it seems like multiple deficiencies. other larger plants on the same nute formula (little higher) are raging, like out of control too big overgrowing the tent (at 1.4-1.8EC). these little ones are getting 1.0-1.4 EC, pH 5.5-6.0 hand water every day. i knew these were lacking but didnt know how bad it was until i got them under some white light today. they should be dark green for as much N as im giving them. only micro deficiency that seems to match symptoms is molybdenum but jaks has that unless its being locked out. checkout the crinkly purple center of that one fan leaf where all the blades come together
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formula at full strength (~2.2 EC) should calc out to something like this:
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help! i dont wanna switch back to GH if i dont have to, but i always had flawless seedlings before the switch. the only other thing i could think about is i always ran from 6.2 up to 6.8 pH but like i said have dropped down to 5.5-6.0 and am pretty rigorous about it. i wonder if something is being locked out by that pH that the little girls dont like
ive got em under ~250W of 3000k 90 cri now with fans blowing the warm air down on them, they should like that a lot. rest of girls are lovin that nute mix. heres the mom tent next to it with 2 1825s at 50-70W each (2700 90 in back, 5000k 70 in front) and a 220W osram solarstorm off to the front left. girls are about 4 feet tall and need to be cloned out but they look great (sour d)
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