A shortage of calcium and/or magnesium in the plant, often appearing as interveinal chlorosis, leaf spotting, or tip burn. Common in coco coir grows due to the medium's cation exchange properties.
Mr. Q called out the CO2 room clones as looking 'nitrogen deficient and cal-mag deficient.' Dakota confirmed he increased cal-mag supplementation along with stepping up the EC when plants recovered. Cronk Nutrients' cal-mag product was used.
Discussed in: Ep 001