Field guide
Pollen library
Every species PollyMap partners regularly identify, with seasonality, symptoms and where it lives.
Winter–early spring (December–March)
Juniper Pollen
Juniperus spp.
Juniper trees release dense yellow pollen clouds visible from a distance. In the desert Southwest juniper is the #1 cause of winter allergy attacks.
Late spring–early summer (April–July)
Mesquite Pollen
Prosopis spp.
Mesquite blooms when desert temperatures climb, releasing wind-borne pollen alongside its sweet fragrance. A defining allergen of desert spring.
Spring (April–June)
Olive Pollen
Olea europaea
Olive trees release highly allergenic pollen in massive bursts each spring. Many Southwest cities have banned new plantings because of how aggressive olive pollen is.
Late summer–first frost (August–October)
Ragweed Pollen
Ambrosia artemisiifolia
A single ragweed plant can release a billion grains of pollen. Light, buoyant grains can travel 400+ miles, making ragweed the dominant fall allergen across America.