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Pollen and Mold Center
Willow Family (Salicaceae Family) - POPLAR

Get readings about Willow and Poplar aeroallergens.

Two important genera:
Willow (Salix) and Poplar (Populus)

Tree pollen is dominant in the spring.
Willow pollen season extends from March to June.
Poplar pollen season extends from February to June.

Willow and Poplar trees in Missouri:
  • White Willow (Salix alba)
  • Weeping Willow (Salix babylonica)
  • Pussy Willow (Salix discolor)
  • Crack Willow (Salix fragilis)
  • Black Willow (Salix nigra)
  • White Poplar (Populus alba)
  • Eastern or Common Cottonwood (Populus deltoides)
  • Lombardy Poplar (Populus nigra)
  • European Aspen (Populus tremula)
Facts about Willow and Poplar
Willow and Poplar allergenicity
  • Willows flower in March and April. They are mainly insect- pollinated. It is not a strong allergen.
  • Poplars, aspens, and cottonwoods are entirely wind-pollinated. These mildly allergenic trees bloom in April and May.