Are the yellowing plants on the inside section of grow room or on the outside? Check feed lines and make sure they are not pinched/clogged. If yellowing plants were directly under the lights and good plants run around the outside then I would say heat/light issue but more info would be nice.
tinytoon Reviewed by tinytoon on . Can anyone please Could any please give me some advice please, I am currently growing 10 plants under two 600w metal halides, the are in 15 litre pots with canna coco I am feeding ph 5.5 Canna coco a&b 10ml per 10 litre of water Rhizotonic 20ml per 10 litre of water. Rating: 5