That's interesting, the business about the reversion. I checked my largest clump, it's about 3 metres in diameter and has well over a hundred individual plants now. There is some variability, could only find 3 plants that seemed to be the reverted ones. Quite a lot of them had new leaves without the distinct yellow borders but the older leaves (on the same plants) still had the yellow borders. Some of the plants also have new leaves with the borders already. Plus, there's some with multiple yellow stripes.
