Answer: Although many perennials retain a so-called evergreen crown or some foliage allwinter, many of them are not as "presentable" as one might like by spring, especially if compared to some of the evergreen shrubs for instance. You might take a look at Bergenia and the evergreen daylilies (Hemerocallis) as well as creeping germander and possibly the typical evergreen groundcover with blooms in spring, Vinca minor or creeping myrtle. Another possibility might be the Christmas fern, depending on how late into the morning the site receives sun. If the location is in full sun all morning, you could consider Dianthus "Bath's Pink" which is quite reliably evergreen, drought tolerant and also very tolerant of summer humidity -- it thrives in Atlanta. If you can locate some of these at a public garden or a display garden so you can see how they look in March, after the winter, that might be a good idea. I hope this gives you some options.
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