Washingtonia robusta
commonly known as Skyduster or Mexican Cotton Palm, is a species of palm tree native to northwestern Mexico. It belongs to the family Arecaceae and is widely cultivated for its attractive appearance and suitability for landscaping purposes.
This is the slimmer of the two species of Washingtonia and considered to be slightly less cold tolerant, though it grows considerably taller than W. filifera. When young, the two species are not easy to tell apart, though it becomes increasingly evident as they mature. In some areas, W. robusta may be somewhat overused and is often the first choice of the street planner, influenced no doubt by its ready availability, fast growth, and consequent low price, but also by its many virtues as an avenue tree. Given the choice of the two species of Washingtonia, however, W. robusta should be chosen over W. filifera by those in areas of higher rainfall, as it is more tolerant of dampness and humidity than its cousin, and will do well in almost any climate between temperate and tropical.
Here are some key characteristics of Washingtonia robusta:
1. Appearance: The Skyduster palm is a tall and slender tree that can reach heights of up to 30-40 meters (98-131 feet). It features a straight, columnar trunk that is typically gray in color. The trunk is covered with persistent leaf bases that create a characteristic diamond-shaped pattern.
2. Leaves: The leaves of Washingtonia robusta are large, palmate, and deeply divided into numerous segments, giving them a fan-like appearance. They can grow up to 1.5-2 meters (5-6.5 feet) in length and have a green coloration. The leaf stalks, known as petioles, are armed with sharp, curved spines.
3. Flowers: The Skyduster palm produces flowers that are small, creamy white to pale yellow in color. These flowers are held on large, branched inflorescences that emerge from the upper portion of the tree. The flowers are followed by small, spherical fruits that contain a single seed.
4. Growth Habitat: Washingtonia robusta thrives in warm and arid climates. It is often found in desert regions with low rainfall and can tolerate high temperatures and strong winds. It prefers well-drained soils but can adapt to a wide range of soil types.
5. Cultivation: The Mexican Cotton Palm is a popular choice for landscaping in many regions due to its fast growth, attractive appearance, and tolerance to drought and poor soil conditions. It is commonly used in parks, large gardens, and along streets to create a tropical or Mediterranean ambiance.
6. Maintenance: Skyduster palms require regular maintenance, including watering, fertilization, and pruning. Adequate watering is necessary during the establishment phase, but mature trees are relatively drought-tolerant. Pruning is usually limited to removing dead fronds or those that pose a safety hazard.