California fan palm cold hardiness
Washingtonia filifera (T.Moore & Mast.) H.Wendl. ex de Bary
Outdoor verdict
California fan palm lives outside where winter stays above about 18F (USDA 8b+). If your winter drops below that, skip it. Do not wrap a tropical and hope.
The stout desert fan palm native to California and Arizona oases. USDA 8b to 11, hardier and thicker-trunked than the Mexican fan.
Cold hardiness
Survives about 18°F / -8°C. Outdoor range USDA 8b–11a. Hover or click a zone, state, or country. Click a state to open palms that grow there.
Highlighted USDA zones 8b–11a. Green countries can be grown outdoors.
United States
In range Too cold
World
Native Can be grown
Alaska and Hawaii are state outlines with their overall zone range. A country is painted if its mildest inhabited winter is at least one USDA step milder than this palm’s hardiness.
What it is confused with
Nurseries often mix this up with Mexican fan palm (Washingtonia robusta). Check the Latin on the tag.
Winter care
Drainage matters more than a blanket. Soil: Any well-drained soil. Water: Water when the top inch is dry (mesic to xeric). Wrapping does not buy an extra zone. If the winter is colder than the kill number, keep it in a pot.
Scientific facts
- Native oasis palm of the Colorado Desert, not a tropical import.
- Threads on the leaf segments give the filifera name.
- Thicker trunk and shorter ultimate height than Mexican fan palm.
Region of origin
Southern California to Arizona and northwest Mexico
Native countries
Historical discovery
Thomas Moore and Maxwell Masters published Pritchardia filifera in 1876. Wendland placed it in Washingtonia. It is the only palm native to the western United States.
Names
Common names
California fan palm, Desert fan palm, Cotton palm
Synonyms
- Pritchardia filifera T.Moore & Mast.
Full care guide
The California fan palm is the stout oasis palm of the western deserts, and the only palm native to the western United States. USDA 8b to 11. It is thicker, a bit hardier, and usually shorter at maturity than the Mexican fan palm that cities plant as a skyduster.
Growth Rate:
Moderate, faster with irrigation in heat.
Fruit and Flowering:
Small black fruit. Coyotes and birds eat them in native groves. Seedlings appear in irrigated urban soil.
Light Requirements:
Full sun.
Water Requirements:
Oasis logic: dry air, water at the roots. Deep water in heat. It is not a cactus. Do not plant it in a sealed clay bowl.
Maintenance Level:
Medium. Skirts are habitat and fire fuel. Feed in the growing season with palm-specific fertilizer if you irrigate heavily in sand.
Common Diseases/Pests:
Scale, weevils on stressed trees, and the same Washingtonia wilt concerns as Mexican fan in some California towns. Keep pruning tools clean.
Plant Care:
Full sun, drainage, occasional deep water. Choose filifera when you want the native desert fan, not the skinny Baja skyduster.
California fan palm Frequently Asked Questions:
If you want the western native fan palm, this is the one. Plant it in sun with water at the roots, and do not confuse it with the skinny Mexican skyduster.
California fan palm questions
Will California fan palm live outside?
Yes, if winter stays above about 18F (USDA 8b+). Below that number it belongs in a pot.
What do nurseries mislabel California fan palm as?
People tag it as Mexican fan palm. That plant is Washingtonia robusta. Check the Latin.
Pot or ground for California fan palm in a cold state?
Ground where winter stays above about 18F. A pot does not make a cold-tender palm hardy. Skip it if the number fails.
Is this the palm in Palm Springs?
Yes. Native California fan palms form the oasis groves of that desert.
Hardier than Mexican fan?
Usually, yes, and the trunk is thicker. Mexican fan still wins if you only want height fast.
Can I grow it in Texas or the Southeast?
In warm, drained sites, yes as a landscape fan. Humid summers are not its native climate, but it is widely planted.
Do I have to keep the skirt?
No. Wild groves keep thatch. Cities often trim. Fire and rats are the usual reasons to cut.
Related palms
The mix-up, the substitute, then nearby hardiness.
