These lilies grow in several different flower beds, one clump by the pond which is a southwest exposure and one clump in a large "keeping" garden which is fairly shaded by surrounding trees. The keeping garden is an area which has become a lovely flower garden over the last few years by default, as the area was an old vegetable garden which became too shaded for growing healthy vegetables, and was used to put perennials in until they found a better home. Needless to say some of the perennials grew very well here and have never been moved.
I believe these lilies are tiger lilies but more research needs to be done to verify that fact and also to learn about their peculiarities.