The Eastern Cottonwood (Populus deltoides) is one of the largest and fastest-growing deciduous trees in eastern North America, a towering presence along riverbanks and floodplains where its massive trunk, broadly spreading crown, and distinctive triangular leaves create an unmistakable silhouette. In early summer, female trees release clouds of cottony seeds that drift through the air like summer snow, one of the most dramatic seed-dispersal displays in the plant kingdom.
• Reaches 20 to 35 meters tall with a massive, broadly spreading crown
• One of the fastest-growing trees in eastern North America, adding up to 2 meters per year in ideal conditions
• Female trees produce enormous quantities of cottony seeds in early summer
• Triangular leaves with flattened stalks flutter in the breeze
• A dominant tree of floodplain and bottomland forests across eastern North America
Taxonomie
• Ranges from southern Quebec and Ontario west to southern Manitoba and North Dakota, south to Texas and northern Florida
• Also found in the Great Plains along river corridors
• Found at elevations from sea level to approximately 600 meters
• A dominant tree of floodplain forests, bottomland hardwoods, and riverbank communities
• Particularly abundant along the Mississippi River and its tributaries
• Described by the German botanist Bartram Ludwig in 1778 as Populus deltoides
• The species name "deltoides" refers to the delta-shaped (triangular) leaves
• The "cottonwood" name refers to the cottony seed hairs that cover the ground in early summer
• The state tree of Kansas and Nebraska
Bark:
• Gray to yellowish-gray, developing thick, deep ridges and furrows with age
• Young bark is smoother, with a yellowish-green to grayish tint
• Old bark is deeply furrowed, sometimes with conspicuous buttressing at the base
Leaves:
• Alternate, triangular to deltoid, 7 to 15 cm long and nearly as wide, with coarsely toothed margins
• Bright green above, paler beneath, with a distinct flattened gland at the base of the leaf blade
• Leaf stalks are long and flattened, allowing the leaves to flutter noisily
• Fall color is yellow, often unremarkable
Fruit:
• Small capsules in pendulous catkins, 10 to 15 cm long
• Seeds are surrounded by cottony hairs that facilitate wind dispersal
• Female trees produce enormous quantities of cotton in early summer
Size:
• Typically 20 to 35 meters tall and 80 to 150 cm trunk diameter
• Exceptional specimens exceed 40 meters and 200 cm diameter
• Very fast growth rate, reaching 15 meters in 10 to 15 years
• A dominant canopy tree in floodplain and bottomland hardwood forests
• Extremely fast growth makes it an effective pioneer species on newly deposited river sediments
• Provides critical habitat for an enormous range of wildlife
• Seeds and buds are food for finches, grosbeaks, and waterfowl
• Leaves are browsed by deer and beaver
• Massive trunks develop cavities used by owls, woodpeckers, raccoons, and other cavity-nesting wildlife
• Cottonwood galleries along western rivers are among the most important bird nesting habitats in North America
• Root systems stabilize riverbanks and reduce erosion
• Fast decomposition of cottonwood leaf litter enriches floodplain soils
• Cottonwood-willow riparian forests are a priority habitat for conservation across the western United States
• Widespread and abundant across eastern and central North America
• However, riparian cottonwood forests have been dramatically reduced in the western United States by dam construction, water diversion, and livestock grazing
• Western cottonwood galleries are among the most threatened forest types in North America
• Restoration of cottonwood riparian forests is a priority for many conservation organizations
• Some conservation concern exists for the plains cottonwood populations affected by dam-regulated river flows
• Hardy in USDA zones 2 to 9
• Prefers deep, moist, fertile, well-drained alluvial soils
• Requires consistent moisture for optimal growth
• Full sun only; very intolerant of shade
• Very fast growth rate of 90 to 200 cm per year in ideal conditions
• Short-lived for a large tree, typically 70 to 100 years
• Weak wood makes it prone to breakage in storms
• Female trees produce messy cotton; male (seedless) cultivars are preferred for landscapes
• Best planted in parks, riparian areas, and large landscapes far from buildings and pavement
• Avoid planting near structures, drainage systems, or underground utilities
Timber:
• Light, soft wood used for crates, pallets, plywood core, and pulpwood
• Historically used for wagon boxes and rough construction
Ornamental:
• Sometimes planted as a fast-growing shade tree in large landscapes
• Male (seedless) cultivars such as 'Siouxland' are preferred to avoid cottony seed mess
Ecological restoration:
• One of the most important species for riparian restoration in North America
• Fast growth and flood tolerance make it ideal for streambank stabilization
• Cottonwood-willow plantings are standard for riparian restoration projects
Cultural:
• Cottonwood was an important tree for Plains Indian tribes
• The inner bark was used as a food source (cottonwood bark cambium)
• Cottonwood logs were used for tipi poles and travois
• The cottony seeds were used as absorbent padding for infant cradleboards
Wusstest du schon?
The Eastern Cottonwood is one of the fastest-growing trees in eastern North America, capable of adding 2 meters of height growth per year in ideal conditions. In early summer, a single large female tree can release over 40 million cottony seeds, each equipped with a tiny parachute of silky hairs that can carry the seed for kilometers on the wind. This cottony blizzard is one of the most dramatic seed-dispersal events in the North American plant world.
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