Sedum - Growth well even in the bad and well-drained soil and produces star-like flowers in clusters.
Russian Sage - Drought resistant, deer resistant with airy lavender-blue flowers that happen to contrast beautifully with fall colors.
Japanese Anemone - This introduces elegant flowers in the end of the season and is suitable in the mixed borders or in the shade-to-part-sun conditions.
These are Fall Flowering Perennials that are tough and come back year after year and are easy to care about, which is ideal in the planning of sustainable gardens.