The first pic is of my trough of Lewisias that I'd planted earlier. The second is of the cut off top of a black plastic drum planted up today with Lewisias. I'd only a couple of plants spare to put into it. I'll get some more later on. It's filled with my home made acidic soil between volcanic rocks.
Oh, lovely, I had some Lewisias a couple of years ago but only for the one year and I lost them. Just love your volcanic rock scenario, that is really special, but also love your trough!