Xeriscaping and xerogardening refers to landscaping and gardening in ways that reduce or eliminate the need for supplemental irrigation. It is promoted in areas that do not have easily accessible supplies of fresh water, and is gaining acceptance in other areas as climate patterns shift. (Wikipedia)
Check out the link given below. It has some cool tips on how to xeriscape your gardens.
A xeriscaper is someone who practises xeriscaping, a form of landscaping in ways which do not require irrigation.