Ornamentals are awesome in raised beds. I built a quasi-raised bed last year from retaining wall block and planted hostas and coleus inside. Perhaps quasi isn't the right descriptor to add to the raised bed.
Raised beds let you control the soil characteristics. It's not a bad idea to test the soil on occasional using your local extension service. They can do a complete soil analysis and advise you on on what to add to grow various plantings. Soil tests mostly analyze for edibles but many edibles need the same or similar soil conditions as the ornamentals.