Do you mean the curved pot and the broken/dead parts?looks like water lilies, don't let them dry out, healthy looking! You may want to divide them as spring arrives. The pot looks a bit crowded.
I didn't think I could separate them. Is it quite obvious?
The pond is quite deep except for around the edges and I'm sure I remember the lillies being more central so the pot must have been floating?
I hope they can regrow with any advice given. The pond looks empty and I'd hate the fish to have no shelter.
Is the reason the timber edging is there because the blue stones are higher than the level of the edge of the pond?
I think so, that or it prevents people accidentally walking into the pond?
I'm a little wary about removing the wall yet. The posts are going through the liner, or at least a different liner that the slate is sitting on.