Color change in a Hombolt co. Green Crack

My plant has a black color starting from the bottum up. Thought it was afungus or mold bt after close exam it’s changing color. It’s been cold and dap in midcoast Maine but plant is developing. Has anyone seen this color change or will it turn to anothercolor. Is this anthing to worryabout.

If you can post a few close-ups of the area in question, and a couple full shots, the experts here will definitely be able to help. I’m not one of them, but it’ll be hard to diagnose without seeing it. Good luck and happy growing!!


Have a pic of this? Would really help…

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