But, there needs to be a valid reason to do this. I am reminded of a happening early this decade wherein a National Award for the Conservation of Water in the U.S., presented by a national organization in that country, went to a woman in Denver, Colorado. She had spearheaded the passing of a municipal bylaw in that city banning Kentucky bluegrasses from all lawns. The theory was that bluegrasses use more water than other types. The same is true of many other plants recommended for planting in xeriscape gardens.
Trees are a good case in point.
On the other hand, grass has a number of other attributes we tend to forget. Please don't get me wrong. I am not saying don't take water conservation into account when you plan and plant your garden. I am saying that none of us should be hoodwinked into thinking we have to stay to a short list of plants that some one or some group states are the only ones to plant because they are water conserving. If water conservation is a major factor, for whatever reason, there certainly are plants that withstand drought better than others.