Washingtonia robusta (Mexican Fan Palm), filifera (California Fan Palm) and x filibusta (hybrid of the two species). These may be hybrid Washingtonia x filibusta as the seeds were collected from a tree on a golf course. These are a common sight in Arizona and are one of the easiest palms to grow. Native to desert regions in Mexico and California, they are drought tolerant and grow quickly, but they are not cactus and cannot be treated as such. They grow naturally in canyons where they get regular water due to runoff. They require regular water during periods of drought but during the rainy seasons of the year will thrive with minimal supplemental irrigation. They can grow from 50 to 100 ft. depending on whether they are robusta, flifera or filibusta. (Zones 8-11)