Cottonwood (Tree)

Description

Cottonwoods (Populus species) are fast-growing, large deciduous trees known for their broad canopy and triangular or heart-shaped leaves. They are particularly recognized by the fluffy white seeds resembling cotton that fill the air in late spring and early summer. While visually dramatic, the pollen—not the fluffy seeds—is what primarily triggers allergies.

Allergy Symptoms

Cottonwood pollen commonly causes:

• Sneezing and nasal congestion
• Runny or itchy nose
• Itchy, watery eyes
• Throat irritation or cough
• Possible exacerbation of asthma symptoms

Cottonwood pollen often aggravates symptoms in individuals who also react to other related tree pollens, such as willow or aspen.

Typical Pollination Period

Cottonwoods typically pollinate in early to mid-spring (late February through April), earlier in warmer regions. The release of seeds in late spring or early summer is often mistakenly blamed for allergy symptoms, though it’s actually the pollen released weeks earlier that triggers reactions.

Geographic Distribution

Cottonwood trees are widespread across North America, Europe, and parts of Asia:

• North America: Particularly abundant in the central and western regions, near rivers and streams.
• Europe: Widely cultivated and naturally occurring across temperate regions.
• Asia: Common in temperate areas, especially northern China and parts of Siberia.

Tips for Reducing Exposure and Managing Allergies

• Track pollen counts regularly and minimize outdoor activities on high-pollen days.
• Keep indoor spaces pollen-free by closing windows and using HEPA air filtration.
• Regularly wash clothes and shower after outdoor exposure to remove pollen.
• Take antihistamines or nasal sprays preventively during the pollen season.
• Consult an allergist for testing and possible immunotherapy to reduce symptoms significantly.