After nearly two weeks, the seed for the Irish moss had produced nothing, so I broke down and got more actual plants. These didn’t look exactly like the plants I had already planted. It will be interesting to see whether they blend or not.
I got a whole flat of 10 plants and used five of them in the center of the labyrinth:
I actually split the plants and spread them out in the channels of the vesica. I have five more and may plant them over at the entrance to the gentlemen’s loo.