My Edelweiss have survived a second winter and are multiplying. But this spring they seem to be sitting an inch higher above the surrounding ground. The roots aren't exposed. (yet?). The plants are in very sandy, stony, somewhat acidic soil. I ought to have posted here first but I went ahead and spread ground dried eggshells around them, then covered those with coarse sand to make a gradual slope down from the base of the plants to the surrounding dirt. Was this a good idea? Or should I do something else? I'd hate to dig up and replant...