If you live in an arid or dry region you might consider creating a paradise garden.   The most basic feature of paradise gardens is that they are enclosed by walls or other structures.  This helps make this type of garden water efficient.

This type of garden evolved as a way to have a lush garden in desert or semi-desert climates.

The Paradise garden is a form of garden, originally just paradise, a word derived from the Avestan language, or Old Persian. Its original meaning was a walled-in compound or garden; from pairi (around) and daeza or diz (wall, brick, or shape). The name has come to be commonly used in English and other European languages as an alternative for heaven. Because of the additional meanings for the word, the enclosed garden of the original concept is now often referred to as a paradise garden.

The Taj Mahal is an elaborate paradise garden. You can make a smaller version for your home. 

Character and Layout of Paradise Gardens

The paradise garden takes some of its character from its original arid or semi-arid homeland. The most basic feature is the enclosure of the cultivated area. This excludes the wildness of nature, and includes the tended, watered greenery of the garden. The commonest and easiest layout for the perimeter walls is that of a rectangle, and this forms one of the prime features of this kind of garden. Another common theme is the elaborate use of water, often in canals, ponds or rills, sometimes in fountains, less often in waterfalls of various kinds.

The rectangular or rectilinear theme of the garden is often extended to the water features, which may be used to quarter the garden. This layout is echoed in the four rivers of the Garden of Eden, and much of the use and symbolism of the paradise garden is derived from this connection. The contrast between a formal garden layout with the informality of free-growing plants provides a recurring theme to many paradise gardens.

Gardens Derived from Paradise Gardens

The Persian paradise garden is one of the handful of fundamental original garden types from which all the world's gardens derive, in various combinations. In its simplest form, the Persian garden consists of a formal rectangle of water, with enough of a flow to give it life and movement, and with a raised platform to view it from. A pavilion provides more permanent shelter than the original tent, and strictly aligned, formally arranged trees, especially the chenar or Platanus, provide shade, and the perimeter is walled for privacy and security. Odor and fruit are important elements in this pairedeza or paradise, which realizes the symbol of eternal life, a tree with a spring issuing at its roots.

The Achaemenid kings set these gardens within enclosed royal hunting parks, a different landscape garden tradition, which they inherited from the Assyrians, for whom the ritual lion hunt was a rite that authenticated kingship, far more than a mere royal sport.

It became the foundation of much of the garden traditions of Islam, and later on of Europe. Examples of the paradise garden and its derivatives can be seen today in many of the historic gardens of Islamic and European countries. In the east, the Persian garden gave rise to the Mughal gardens of India, a late example of which is the grounds of the Taj Mahal at Agra. In the farthest west, it is best known by the paved and tiled courtyards with arcades, pools and fountains of Moorish Andalusia.

 from Wikipedia, the free encyclopedia