I'm in zone 7. Sounds hard being in between zones. I wish I could have hibiscus and purple fountain grass survive the winter but it's not going to happen. I could bring my hibiscus inside but I don't have the room. Or should I say I've been too lazy to make room. I've heard that sometimes purple fountain grass can survive the winter in zone 7 but I've had no such luck. This year I'm going to try to cut them back (but not down to the ground) and wrap them in burlap. My husband hunts so we have some feed sacks that I can use to cover them. He reuses the sacks to get corn. Anyway, I'll see if that works. I may try taking small diggings from the grasses, plant them in a pot, and bring them inside. If the ones outside die, I'll have new ones to plant. I have already taken seeds from my zinnias, merigolds, greber daisies, coneflowers, and blackeyed susans. My wax begonias still look great so I make bring them inside. I'll also get some seeds from them. I can't wait to cut back my russian sage and lemon verbania. The branches dry out and smell so good. I love putting them in mason jars or hanging them in a room. Next year I hope to make another bed and add more varities of cone flower and dahlias. Maybe some hollyhocks and joe pye. (My wheels are always turning.) It takes some time figuring out what plants survive/thrive where in your garden but it is so worth it when you achieve your results. Plus it's fun! Oh, and don't forget to compost.