You could maybe grow butterfly bush. They could give you a somewhat tropical look with those interesting flowers and also they smell pretty and attract butterflies. I don't know if you can grow fatsias in your area but those have a nice tropical shaped leaf. Another thing you could try is clumping bamboo. Elephant ears and cannas should pop up after each winter. A hardy banana could work too.Thanks, I've never heard of those, and they do look like hibiscus. I'll have to see if the local nursery carries those. Our tropical look is definitely missing the flowers. When they were both blooming they looked awesome. Here is a shot of before they took off. They are in the corners of the retaining wall.