Over the weekend I noticed some of the leaves on my Den had taken on a faint watermark pattern. It was barely visible and at first, I thought it was a trick of light. By Monday it became noticeable. Two leaves fell off from the new canes.
I took the pictures below on Monday. The flash enhances the contrast in colors and makes the discoloration appear brighter than it was. I couldn't get the pattern to show up without flash photography. But by Wednesday, the leaves now look pretty close to what's in the photos.
In one of the pictures you can see a section of a can has turned dark.
It now kind of looks like sun burn but not really. The odd thing is that it's been kept outdoors for a few weeks in a shaded area where it would get some light morning sun. Surely, the sunburn would have appeared sooner. I haven't repotted it, since I purchased it in Feb. The only thing I did to it was trim two spikes that were done blooming.
I don't know what to make of this. Help.