Answer: Plumbago is such a reliable plant for your region that I think you should keep it and simply draw more attention to it with a few companions. A dramatic grouping would combine your plumbago as background for perennial Chicago Picotee Lace Daylily, (Hemerocallis x 'Chicago Picotee Lace') and Blue Storm Lily of the Nile, (Agapathus praecox orientalis 'ATIBlu'). I think the color combinations would work for you. Enjoy your garden!
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