I highly recommend the Lariopes for dealing with hillside erosion. Our house in Annapolis sits on a hill with a severe slope about 10 feet down to the water. The trees along that hillside are having the same problem — soil eroding out from below and roots exposed. We have embarked on a major hillside stabilization project, adding dirt around the trees and using Lariope to control the erosion. It works. The hillside is much more stable than it was a few years ago. I don’t know the type of Lariope we use (Frau Blau would know that), but it only grows to about 6 or 7 inches, and, for a border off the lawn, that is fine, so no cutting is necessary. The Lariope is also highly tolerant of shade.
Thank you for that suggestion. I have been looking online at them and it looks like that may help us out. I hope that we can find a local source for them. I emailed my wife and she said that may be the plants that she has been seeing near her job that she likes.