Washingtonia is a plant genus comprising just two species of palm trees that are native to the southwestern United States and northwestern Mexico. One species that is particularly popular among gardeners is Washingtonia filifera. This palm tree is commonly known as the desert palm. It grows 40 to 60 feet in height and spreads 10 to 15 feet. The huge star shaped leaves and extremely long trunk give a tropical feel to any yard. It is an ideal tree for sidewalks or entryways.
There are several things to consider when planting and growing the desert palm. The condition of the soil, the climate, and certain pests or diseases can affect the health of Washingtonia filifera.
Climate
This tree grows well in hardiness zones 9 to 11. It can thrive under full sunlight or partial shade.
Soil Conditions
The desert palm requires well-draining soil. Compost rich soil is best, but it will tolerate most types of soil including loamy and sandy soil. It will also tolerate acidic or alkaline soil pH.
Watering and Fertilizers
This tree is extremely drought tolerant, but it should be watered on a regular basis to maintain a lush foliage. The desert palm doesn’t require fertilizers to reach its maximum growth. In fact, this species may become invasive in some locations due to its frequent seeding.
Propagation
The best way to propagate this tree is by sowing seeds. In fact, relatively old seeds that are stored can germinate quite easily.
Pests and Diseases
Scales are a problem during the first few years of growth. As the desert palm matures, the weevil becomes the main concern. Root rot is a fungal disease which is a problem for trees grown in poorly draining soil.
Reference:
Edward F. Gilman. Washingtonia filifera: Desert Palm – University of Florida IFAS Extension
Washingtonia filifera – Floridata