Washingtonia robusta is an evergreen, flowering, slender, graceful, perennial fan palm with an erect stem and compact canopy. A fast-growing palm. The trunk is thinner and taller, crown is smaller and more compact than washigtonia filfera. Leaf stalks are shorter, grooved on their upper surface and with distinguishing reddish streaks on undersides. The leaves are richer green, more deeply cleft into their segments which tends to make them droop at the margins.
This palm does not develop a crown shaft. Grows 8-10m tall with a 2- 2.5m spread and a 20-30cm stem diameter. Noted as reaching 24-30m tall with a 2- 2.5m spread and a stem diameter of 30-40cm in its native habitat. Medium growth at a rate of 40-60cm p/a.