Answer: Kurt Bluemel, Inc. is a mail-order supplier of ornamental grasses and other perennials, and they offer a number of groundcovers that do well in deep shade. For a catalog, call 410-557-7229 (Maryland). In general, hostas and some species geraniums are happy in the conditions you describe, and the catalog includes offerings of these as well. I would warn you against planting comfrey, because it can be very invasive and difficult to keep in bounds. I usually recommend planting comfrey in containers,just to keep it under control.
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