One more thing...
I would wait till Spring when you start to see new growth, then remound them. The moss still looks really clean and algae free so they should be just fine that way through the winter. I can't see the other side of your Surugafukurin but it looks like most of the axis is buried in the moss? If you can't see what the tsuke is, then the plant is too deep in the moss and that may lead to taa daa...ROT.
Thank you, Tracy. I wasn't planning on touching them until the spring. I will take a pic from the other side tomorrow and post it here. Rot is not wanted!