Populus fremontii
Western Cottonwood
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Western Cottonwood (Populus fremontii) - Description
Populus fremontii, the Fremont cottonwood or Alamo cottonwood, is a cottonwood (and thus a poplar) native to riparian zones of the Southwestern United States and far northern Mexico. The tree grows near streams, rivers, springs, wetlands, and well-watered alluvial bottomlands at elevations below 2,000 m (6,600 ft) elevation.
Western Cottonwood (Populus fremontii) - Blooming
Male and female catkins on separate trees borne in late winter or spring before the leaves.
Western Cottonwood (Populus fremontii) - Growth
Fast-growing deciduous trees, native to northern temperate zone. White or gray park, and leaves that flutter gracefully in the wind. Invasive root systems, so avoid growing within 100' of a building. Populus does best in full sun. P. alba and P. x canescens flourish in coastal regions. Populus works best as a windbreak.
Western Cottonwood (Populus fremontii) - Planting
Propagate from hardwood cuttings in winter. Can also propagate from suckers in fall or late winter.
Western Cottonwood (Populus fremontii) - Pest
Leaf miners, borers, scale insects, caterpillars, and leaf hoppers. Populus is also prone to canker, butt rot, powdery mildew, root rot, dieback, leaf blister, white rot, rust, and crown gall.
Western Cottonwood (Populus fremontii) - Interesting facts
The name Cottonwood comes from the fluffy white seeds produced by the female catkins. (Catkins are the specific term for a type of inflorescence of flowers that is found in the Populus genus. The leaf buds and unfolding leaves are often aromatic. Some of the most massive living things on earth are colonies of poplar that spread through root suckers, one in Utah is nick-named "Pando" and is an estimated at well over 6,000 tons.
Western Cottonwood (Populus fremontii) - Soil and irrigation
Moist, but well-drained soils that are deep and rich. Does not tolerate over-watering. P. alba and P. x canescens can withstand dry conditions.
