It survived. In fact, I just moved one plant (Salvia greggi "Flame", none too healthy on its own account) out of the path of the spreading Cistanthe. Due to mistaken understanding of which type of Cistanthe this was, I thought it would remain a bit smaller. And anyway, when planted out, it didn't look like it would live, let alone thrive. Now it is clearly C. grandiflora, and it is full 2 1/2 ft (76 cm) across though still only a bit over 1 ft (30.5 cm) high. I'm assuming it will stop at about 3 ft, but I have no indication that the plant is aware of this limit!
Foliage is rich gray succulent, nothing special in terms of sparkle or texture, but a little soft to the touch, with a gently curved shape terminating in a light point. It has formed a dense mound of rosettes with bloom stems starting from the centres.
Did I say spectacular?