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I've been thinkin about our clones today. We have been using these cheapo plastic drinking cups to hold the newly-rooters for 1-2 weeks after they come outta the clone box. They generally look OK and do well. The probs always start 1-2 weeks after we transplant them into larger pots (the normal plastic 4" square pots...or 6" coco pots).
Could the mutations be caused by some sort of off-gassing from these plastic cups? Making sense to me if so...although the delayed onset of the problems kinda makes me wonder if...maybe not?
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Never had problems with them..do you keep them in a tent?..I've heard some cheapo tents can off-gas. One way toi know for sure is to skip the cups. Clones look healthy btw.
I'm thinking the CoCo is your problem...like they are drying out in the cups. Could you try some peat in the cups then up-pot to CoCo?