I love how every problem on this board is attributed to pH and people even go as far as to demean other peoples' opinions that differ from that. How dare you tell the board to shut up and only listen to your opinion(Buddha), just state your fucking case and get on with it..anyway.
I doubt its a pH problem considering these plants are growing in the ground. Its not like the pH of the Earth just suddenly shifted and caused now it needs to be corrected. Now, your plants that were in containers and outdoors are a completely different thing. You could easily fuck up the pH of a container plant inside or outside. If this plant has grown to 6' tall stuck in the earth than its not all a sudden a pH problem. The color and pattern, to me, suggests the beginings of mold from all the moisture you are experiencing. This is just my opinion and I RESPECT the guesses of everyone else in this convo, afterall we can only make educated guesses without being able to see the whole plant ourselves..