Yarrow - Achillea millefolium
Yarrow makes another super xeriscape plant. It comes in a variety of colors - my favorite is the sunset orange. Dried yarrow can be used to stop bleeding, reduce stomach and menstrual cramps, and ease digestion.
Pot Marigold - Calendula officinalis
This sunny yellow flower can be made into a salve that soothes the skin.
Lemon Balm - Melissa officinalis
It's easy to grow, smells wonderful, attracts bees, and is very useful for healthful teas, especially for children.
Salvia officinalis - Sage
Sage grow very large here in Colorado, and uses very little water. It has lovely purple flowers that attract bees. It can be used for tea to soothe sore throats, and to stuff a turkey.