AllergensHarmful pollen: plants and trees
Rinitis alergica
Suflower, morning glory, prairie hollyhock, oriental lily, evening primrose, and castor bean pollen.
Image: Dartmouth Electron Microscope Facility

Pollen grains are produced by blooming flowers and are made up of tiny egg-shaped male particles. They are needed for plants and trees to be fertilized. The average particle width is smaller than a human hair.
Weeds (like pellitories) can behave as a perennial allergen with almost-all-year-long pollen

Which plants cause allergy?

Plants with bright colours (like roses) normally do not cause allergies. They use to be quite big and travel from one flower to another thanks to bees and insects.
On the other hand, trees, bushes and small weeds have smaller pollen grains especially apt to be widespread though the wind and therefore cause respiratory allergies.

 Azucena
Bright colour flower pollen do not normally cause allergy
Image: www.freedigitalphotos.net
Pollen season may start in January



When can I find pollen?

Every plant or tree has a pollen season that do not change significantly every year. Nonetheless, weather conditions may alter the quantity of pollen in every moment.


Generally pollen season lasts form february-march till october. During spring time (march to june), a high number of different plants bloom at the same time, although the pollen season may delay if the plants are further North located. During fall, another pollen peaks, mainly due to weeds.

Weeds (like pellitories) may behave as a almost-perennial allergen, because the pollen counts are high all-year-round. Depending on the area, the pollen season may start in January, but this can change depending on the climate.


More info

Updated pollen levels in Málaga (source: Málaga University/Andalucia Aerobiology Network)

Polenes.com: Aerobiology Committee of the Spanish Society of Allergy (SEAIC).