Significant metals lockout, possibly zinc most severe, plus magnesium.
Too dry air and/or too close lights.
Significantly rootbound.
Plants too deep in pots.

Flsuh to bring your soil to pH 6.7, using PLANT pH up/down. Use 3x the volume of the pots. Then feed with a complete fert with micronutes at pH 6.7.

Then wait until the soil dries out and re-pot to a pot that is one gallon for every foot of main stem. Soil level should be within an inch of the top of the pot so as not to restirct air flow across the soil surface.
stinkyattic Reviewed by stinkyattic on . Yellow edges and banding on my babies... Hey, I'm a first timer and I've been having this problem with 3 of my four plants. They're yellow around the edges with some lower leaves going completely yellow and eventually falling off. -I initially thought it was a nitrogen issue so I added seabird guano. That didn't seem to help. -When that didn't work, I raised the light (it was a little close) -Tried lowering the PH of the water, but I'm not sure if I'm doing it right. Am I setting the PH of the WATER to 5.5-6.5 or am I Rating: 5