Love those perrinals (sp?) that will come back every year. I'm in zone 4. Some of mine include: coneflowers, yarrow, wooly lambs ears, tulips, lillies, Veronica, peonies, hen & chicks, iris, dusty miller, coral bells, lupine, fern leaf peonies, blue bells, (and I'm sure I'm forgetting some -- cannot remember the names of some of them. My garden changes with the seasons - early tulips, late spring tulips, iris, peonies, lillies, etc. I enjoy seeing the changing show throughout the growing season! Good luck with your garden. Also, even in zone 4, some flowers self seed & come back every year. I believe some that have for me are corn flowers, poppy, and again I 'm forgetting some. Enjoy!