I'm not very saqe about salvias, but Mexican Bush Salvia I know is Salvia leucantha.I've seen it growing in gardens in California... tall, with flowers fuzzy purple and white.Absolutlely not hardy here, but suppose you could grow it in a really big pot.If the purple and white(or all purple sometimes) isn't the right color, then it could be one of several other salvias you're thinking of, as several salvias (and even some artemesias) are referred to as sagebrush.
Don

Thank you so much for the info. I will do some further investigating.

Leslie