Xeriscape is a word that is derived from the Greek word "xeros," which means "dry." The term xeriscape means that very little water is used to maintain a garden. Xericaped gardens used plants that require little water to grow and thrive. Xeriscape gardens are particularly beneficial in hot, arid locales where most plants require copious amounts of water daily.
Aloe vera--and the other members of the aloe family--thrives in heat. The plant originated in the Canary Islands, and is now found in the South West United States. It can tolerate cold snaps down to 23°F (-5°C), but only for short periods of time. Aloe vera grows in full sun, and requires very little water. It will grow with one or two waterings per month. If there is a rain during the month, there's no need to supplement. The aloe vera plant is used medicinally (for the gel that is found inside its leaves), and should be watered more frequently (every seven to 10 days) if you plan to harvest the gel.
The family of echeveria plants include a number of succulent plants that lend themselves to xeriscape gardens. They originated in Mexico. Echeveria prefer filtered light and partial shade. Echeveria can thrive on minimal waterings (once or twice per month) during the hottest months of the year. During cooler weather, gardeners only need to water them every other month.
The family of salvia plants are classified as "sage" plants. They are flowering plants that originated in Southern Mexico and Central America. Salvias prefer full sun to partial shade. They need very little water during the summer. During the rest of the year, they can thrive on rain with no supplementation.
Lantana plants originated in South America. Some hybrids were created in the United States. They tolerate the extreme heat of the south, and can survive short freezes down to 28°F. They require infrequent deep waterings; use a watering spike once or twice a month to hydrate the root system.