what to add to perenial lily garden
I have a garden in front of a traditional porch that is about 4 feet deep and 12 feet wide. It is full of perennial lilies and has a holly tree at the end. In the spring, it is gorgeous with several lily varieties and color. Now that we are in August, though, it is just green. I would like to be able to add perennials between the lilies that would bring color in August and into September. There would have to be enough height to pair well with the lily plants.
The soil is sandy, well-mulched, and has almost daily irrigation. We are in southern DE, about 2 miles from the coast.