Answer: A year round display requires what is called a "Sequence of Bloom", where you choose different plants whose colors and flowers appear at different times, in an orderly succession, so something is always interesting. The following publication should be helpful to you: http://www.tennesseegardener.com/images/currentsample.pdf
It has photos and plant names and explains when each plant blooms. Enjoy!
Q&A Library Searching Tips