Cause of lower yellowing? Senessence? Cold temps?

TrentSteel

Active Member
I have 2 plants of bubba76, mid week 8, the smaller more mature plant has no yellowing or issues as of yet. My larger plant seems to have stalled/slowed a bit, I have recently started dropping temps to 62f-63f at night but raised it to 65f yesterday. This plant with the issue is more exposed to my cold intake air but not direct contact.

The leaves that have yellowed have deep purple stems (cold/stress issue?)
Any help? The plant seems to have slowed and not swelled like the other.

First pic is most recent, last 2 are the progression to this. Any help appreciated.
 

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