Pollen Season

pollen seasonPollen is a fine grain produced by the male flowers of a plant that is transported to the female flower for fertilization and reproduction. The pollens that cause the majority of hay fever symptoms are those that are wind-pollinated, meaning their pollen is carried by the wind to the female flower. The pollens that are primarily wind-pollinated are:

  • Tree pollens
  • Grass pollens
  • Weed pollens

The most common pollens that cause hay fever vary from location to location such as:

  • North America
    • Tree pollens
  • Europe
    • Grass pollens
  • Asia
    • Tree pollens
  • Africa
    • Grass pollens
  • Australia
    • Grass pollens

Below each season is discussed with each locations most important cause of hay fever allergy symptoms.

During the springtime pollen season, between January and April, primarily trees begin to bloom and release their pollen. Trees in some locations, such as Europe, can begin blooming as early as December. Trees known to produce springtime allergy symptoms are:
  • North America
    • Birch trees
    • Alder trees
  • Europe
    • Birch trees
    • Olive trees
    • Plane trees
    • Cypress trees
  • Asia
    • Japanese cedars
    • Cypress trees
  • Africa
    • Acacia trees
    • Willow trees
    • Cypress trees
    • Oak trees
    • Eucalyptus trees
    • Plane trees
    • Poplar trees
  • Australia
    • Wattle trees
    • Ti-tree
    • Birch trees
    • Maple trees
    • Olive trees
    • Poplar trees
    • Ash trees
    • Oak trees

(For more information about tree pollens click here.)

Summer pollen season, between April and August, is when the grasses begin to bloom though it can vary depending on location. For example, grasses located at sea level can pollinate 2-3 weeks earlier than grasses in mountainous areas and in other locations can bloom year-round. Grasses known to produce summertime allergy symptoms are:

  • North America
    • Timothy grass
    • Orchard grass
  • Europe
    • Ryegrass
    • Orchard grass
  • Africa
    • Rye grass
    • Bermuda grass
    • Kikuyu grass
    • Eragrostis
  • Australia
    • Rye grass
    • Bermuda couch grass
    • Kentucky bluegrass
    • Paspalum grass
    • Prairie grass

Unfortunately, studies show that due to the similarities between various grasses if you have an allergy to one type of grass you will most likely react to all of them. (For more information about grass pollens click here.)

Late-summer and early fall pollen season, between August and October, is when the weeds begin to bloom.  Weeds known to produce fall-time allergy symptoms are:
  • North America
  • Europe
    • Ragweed
    • Mugwort
    • Nettles
  • Asia
    • Ragweed
  • Africa
    • Plantain
  • Australia
    • Plantain

(For more information about weed pollens click here.)

 

References

Disclaimer: The information contained in this site is for educational purposes only, and should not be used as a substitute for a licensed physician. Please see your physician for diagnosis and treatment of any concerning symptoms or medical condition. Click here to read the full disclaimer.
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