Rockroses are much more diverse than you would think after seeing what's usually available. The ratty looking Orchid Rockrose (Cistus purpurea) or some of the old fashioned types don't hold up well. Yet there are some spectacular forms out there that, with proper care, will fill that niche for an evergreen shrub with showy blooms. Another bonus is that Cistus are usually deer resistant (the more resinous and pungent the leaves, the better) and they are always drought tolerant. They must have well draining soil (not too fertile is best) and minimal summer water once established....basically ignore them once they get settled in. Cistus thrive in their native Meditteranean climate of hot summers, and mild, wet winters and can do well on a fast draining or rocky hillside. Make sure they are placed in a location that gets winter sun. Rockroses can look great as a mass groundcover (they usually are wider than tall) or mixed in a drought tolerant bed of lavenders, rosemaries, Ceanothus and other Meditteranean plants. Each individual flower doesn't last long but they bloom successively over many weeks. They don't tolerate heavy pruning, just annual tip pruning to keep them compact and.
Here are some of our favorites (we chose the best cold hay varieties from Xeraplants and more info can be found from the Xera Plants website):