Re: New City Grower 3.0 - Sponsored by Twilight Group Co. - Featuring the Spider9 COB
Hey mate, look, I know I don't know, but looks to me you and I are chasing the same problem.
You're leaf damage/coloration is identical to mine, ageing and stages are the same, purpling of stems and trunk same.
You're in flower obviously and I'm not, and that make a difference, and you'd know better than I.
It seems we've got a bit of a double/triple whammy happening.
Higher levels of P & K in conjunction with too alkaline soil may help to lock out Iron and Mag.
In attempting to treat Potassium def for the purpling may exacerbate lock out of Magnesium.
Iron deficiency may be exacerbated if the soil is waterlogged.....Flushing may also responsible for stripping Iron and Mag from the soil...
I flushed and re-pot the worst of all the girls. 1 week later she's a difference girl, and now shows some burning on the tips...deep green colour now too, and has grown the most, but now that may be too much N, not showing any other def signs though.
The others got flushed and fed. They started recovering well, then bang within 5 or 6 days started showing the same symptoms in the new growth. The two sickest of these doesn't seem to be drinking...and the soil is heavy, I think the soil is waterlogged.
I've been flushing and re-feeding, but I guess feeding at the same NPK and micro-nutrient ratio.
So now, instead I have to consider flushing again and re-potting all the others, but what I have to do first is get a good amended soil to go into with a more balanced ratio, so I don't end up with the same problem again.
Now, that's not possible for you in flower right, but maybe you've got to think along the same lines.
Are you thinking you will treat with an Iron chelate first to see if that corrects the issue?
Flush, feed, treat?
I started typing with the intent of helping, but in sharing this morning I've just rambled about my own....oops!
Good morning BAR