California Fan Palm

Washingtonia filifera is the only palm native to California and one of two North American Washingtonia species. It produces a stout columnar trunk topped by a crown of large palmate fronds with distinctive white fibrous threads along the leaf margins—the source of its alternate name, cotton palm. It anchors natural oasis communities in the Colorado and Sonoran deserts and serves as a high-impact specimen tree in hot, dry landscapes.

This palm is extremely drought tolerant once established but naturally occurs near desert springs and seeps, so supplemental irrigation speeds early establishment. Dead fronds persist and drape down the trunk to form a dense skirt that provides nesting habitat for hooded orioles and other cavity-nesting birds; this skirt is often removed in managed landscapes for fire safety. Growth is slow to moderate, and trees are long-lived—some native grove specimens are estimated at several hundred years old. Prefers alkaline or neutral, fast-draining soils and performs poorly in heavy clay or poorly aerated ground.

Cahuilla, Serrano, and other indigenous peoples of the desert Southwest used this palm extensively. The small date-like fruits were eaten fresh, dried, or ground into flour for cakes and beverages, and the seeds were also milled into meal. Leaf fiber was woven into baskets, sandals, and cordage, and the leaf bases were used in shelter construction.