Dry shade is a challenge in the garden, but epimediums and hellebores, two very different plants, both turn dry shade into an opportunity. For years I admired epimediums in other gardens, always asking the name of the beautiful low plant with heart shaped leaves. Sometimes I got no answer, but even when I did I was incapable of remembering the word epimedium. I finally saw a pot of this plant at the Blue Meadow nursery in Montague and,…