Hi Gina,
Thank you for chiming in with your expertise. You're right, I should've unpotted it immediately to check and documented everything, not just the leaves. I didn't even think about the sphagnum moss attached to the roots as a potential problem.
I bought Southern AG's liquid copper fungicide ~2 weeks ago and have Bonide's rooting powder, so I will use that. Should I dilute the fungicide? The instructions for use on the bottle only specify dilution instructions for using as a spray.
It could indeed be a side shoot propagation, though the seller's sold 8 other from the same description--"the mother plant is 3 years old" (new photos each time) after I ordered on May 24 and a couple before me. How prolific in growing offshoots are your mature monsteras?
