Willow

Stone fruits, Apple, Celery and Carrots

Willow trees ( _Salix_ spp.) are a recognizable spring allergen for Phoenix-area residents, particularly those living near canals, riverbanks, and irrigated parks where moisture supports their growth. With over 400 species worldwide, willows thrive wherever water is available, making them a predictable presence along the Salt River corridor and landscaped common areas throughout the Valley.

In Phoenix’s warm desert climate, willow pollen season typically begins in February and peaks through April, overlapping with other heavy spring pollinators like cottonwood, ash, mulberry, and oak. This convergence of airborne tree pollen makes spring one of the most challenging times of year for allergy sufferers in the region, and willow is often an overlooked contributor hiding within that broader spring surge.

Because willow and cottonwood belong to the same plant family (Salicaceae) and share highly cross-reactive proteins, patients sensitized to one are very likely reacting to both. If your spring symptoms seem harder to control than expected, willow cross-reactivity may be part of the reason.

Symptoms typically include sneezing, nasal congestion, itchy and watery eyes, and a scratchy throat. Those with asthma may also notice increased respiratory irritation during peak pollen weeks in April.

If you suspect willow is triggering your symptoms, the team at Carefree Allergy can help confirm it through targeted allergy testing and build a personalized treatment plan. Options range from medication management to long-term immunotherapy to reduce your sensitivity to willow and related tree pollens.