Now Reading below I wonder if they variegate because the leaves are getting to much sun
as you can see if they are flooded they can switch back (maybe to get more sun for plant.)
(note I put plants in shade when stressed to get them back to life
I wonder if the plants prevent light getting to leaves to do the same naturally since they live in place, and not in pot)
Temperature changes can also play a part in variegated reversion, as some plants may revert to get a competitive advantage over the elements. When a plant’s leaves revert back to all green, the plant can increase its harvest of solar energy and get more energy to produce stronger, bigger growth.
Similarly, plants that are waterlogged may also turn back, and their shoots will often come out green.
Why I thought of this Idea of nature acting the way it does, and my confusion with my own results
I thought of this statement I made while posting
but it does contradict what I said
I often put plants in shade to over come stress -- prevent light on plants to over come problems
oddly with flooding I did do to plants IN POTS
Article says variegated plants do the opposite they turn green gathering more light after being variegated reverting back because of flooding
so plants gather more light