Thought I'd just leave it.

Since Nov, last year...
This is what it turned into.
I kinda suspect that sitting in 0.5" / 1cm (ish) of moss on a Sandstone rock is not an ideal home for Primula denticulata. I, equally, suspect it'll be moved, sooner or later.
Optional - leave it and see what happens on account of the fact that I can't stir for the things.