All plants need water to survive. However, like plants that require more water, there are plants that grow in a lack of water. They are the best drought tolerant plants and can live without water for a long time. - Flower Beds and Gardens
Ocotilla - This is a really cool neutral plant that adds a vertical element and height to the garden, yard, and landscape. Other than when it is in bloom the Ocotillo is a grayish neutral color that goes well in most any Southwest desert garden.