All 3 of my Stellas look horrible. Blooms very low and now it looks like half the leaves are dead and the most of the remaining leaves are yellowing and/or have spots.
They are in a very good drainage area. They are 5 years old and haven't been divided. They didn't look great last year either.
GardenWeb keeps rejecting this link, but it does work.
Picture of Sick Stella: