Rosemary is one of my favorite water-thrifty landscape plants. It is beautiful, especially in winter, and feeds honeybees in summer. The hitch is that Rosemary, even the most cold-hardy varieties (e.g. ‘Arp’) are only marginally hardy here in Boise. The solution: find (if you can) the right micro-climate like this one–a warm, sunny, south-facing brick wall. The brick is not absolutely necessary, but it helps.
P.S. Note the purple carpet in front. That is Woolly Thyme in winter, a nice contrast.