Hi Folks,
new to growing cannabis and this forum, though not new to growing plants in general or forums in general. Can anyone help me out with a diagnosis? It could be the lights, general overwatering/nutrient deficiency from having a small pot, or Ca/Mg deficiency? See below and pics.
Thanks!
I started these from seed - Mango, Jack Herer, AK-47 - about 3 weeks ago. They started under T8s in clear (see through) solo cups. When they were about 2 weeks old, I moved them under 2 Citizen COBs (gogreenled) run at about 50w each.
Soon after the move, they began to turn yellow from the bottom up, and the leaves were wilting, with some of the leaves developing brown spots. On a few of the plants (mostly the one in the middle, but not in these pics), also yellowed at the top (first pair of leaves mostly). I noticed later that this soil contained low essential nutrients (.07% N, .05% P, .06%K).
I decided to transplant them. I ended up getting some pretty bunk soil by accident (Burpee "Organic and Natural" Growing Medium - 0.12% total nitrogen 0.12% available phosphate 0.12% soluble potash and 0.12% calcium - this is mostly coco coir in texture, very little mineral or humus). I wasn't happy with what I had, and figuring the plants needed a bit extra oomph to recover, I added plenty of composted manure, which sat outside all summer last year through this winter. The original mixture was about 1/3-1/2 of the composted manure. Also, while transplanting, I noticed the soil of some of the transplants was warm to the touch and quite wet after not having watered for a few days. I didn't make drainholes in the solo cups but I tried to be careful not to overwater and allow accumulation at the bottom of the cup.
About 2 days after the transplant, many plants indicated N toxicity with the classic "claw" forming on some of the leaves. Its visible in some of these pics. So I transplanted again, four of the plants, diluting the original up-potted material with some relatively N deficient soil that grew yellow tomato plants last year. The plants circled in red are the 2x transplants. The yellowing seems to be abating somewhat, though the brown spots seem to still be developing. Also notice that the yellowing is only occurring towards the ends of the leaves, with the center/bottom of the leaves remaining dark green.
new to growing cannabis and this forum, though not new to growing plants in general or forums in general. Can anyone help me out with a diagnosis? It could be the lights, general overwatering/nutrient deficiency from having a small pot, or Ca/Mg deficiency? See below and pics.
Thanks!
I started these from seed - Mango, Jack Herer, AK-47 - about 3 weeks ago. They started under T8s in clear (see through) solo cups. When they were about 2 weeks old, I moved them under 2 Citizen COBs (gogreenled) run at about 50w each.
Soon after the move, they began to turn yellow from the bottom up, and the leaves were wilting, with some of the leaves developing brown spots. On a few of the plants (mostly the one in the middle, but not in these pics), also yellowed at the top (first pair of leaves mostly). I noticed later that this soil contained low essential nutrients (.07% N, .05% P, .06%K).
I decided to transplant them. I ended up getting some pretty bunk soil by accident (Burpee "Organic and Natural" Growing Medium - 0.12% total nitrogen 0.12% available phosphate 0.12% soluble potash and 0.12% calcium - this is mostly coco coir in texture, very little mineral or humus). I wasn't happy with what I had, and figuring the plants needed a bit extra oomph to recover, I added plenty of composted manure, which sat outside all summer last year through this winter. The original mixture was about 1/3-1/2 of the composted manure. Also, while transplanting, I noticed the soil of some of the transplants was warm to the touch and quite wet after not having watered for a few days. I didn't make drainholes in the solo cups but I tried to be careful not to overwater and allow accumulation at the bottom of the cup.
About 2 days after the transplant, many plants indicated N toxicity with the classic "claw" forming on some of the leaves. Its visible in some of these pics. So I transplanted again, four of the plants, diluting the original up-potted material with some relatively N deficient soil that grew yellow tomato plants last year. The plants circled in red are the 2x transplants. The yellowing seems to be abating somewhat, though the brown spots seem to still be developing. Also notice that the yellowing is only occurring towards the ends of the leaves, with the center/bottom of the leaves remaining dark green.
