The word athanasia means immortal so it is rather ironic that my Athanasia pinnata dropped dead when all the plants around it are thriving.
This is one of my great disappointments in the mediterranean bed as this plant was meant to be a large, bold, centrally located specimen. Closely related Hymenolepis parviflora is thriving but Hymenolepis does not have the wonderful silvery foliage that Athanasia has.
Sometimes plants just fail despite out best efforts to keep them happy and there is nothing you can do about it. I’ll probably try again in the fall if I can get ahold of another one.