When the leaves turn yellow in late flower

Nutty sKunK

Well-Known Member
This. Cannabis grows for months in its natural habitat. If they turn yellow there is a deficiency . It's probably due to the release of acids in late flower in search for phospourus and the prodcution of phytic acid for seed production.

I've had to pH compensate in late flower since started growing decades ago. Peat becomes acidic when broken down and the same goes for Coco Coir. Even more so with Pro-mix/Peat that has a ph of 3-4 without any buffers.
Releasing acids makes sense! I learnt the hard way when I removed the silicon from my feed and the plants yellowed out within days mid flower.

I now just add a little silicon (0.5ml per 10L) to keep the mix 6-6.5 range
 
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