Good tips, thank you!! Makes me more willing to try again. I do love semps, and I have a few that I've found locally, deeply rooted in pots... even then, they do best if I put them in containers where the squirrels aren't likely to get at them. I have had no luck at all with semps in the ground... partly because I'm far from being a meticulous weed-puller, but also because even with a little bit of slope and well-draining soil I think it's just too wet over the winter. If I keep a pot in one spot in the rock garden, they should still be able to push roots down down down through the hole in the pot, just like they would if growing in a crevasse.