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Southwestern United States
Information for patients with allergy and related problems
in the Southwest

Tucson Pollen Today and Tomorrow - June and July

Ragweeds have stopped releasing pollen for over a month.   The onset of warm dry weather in the last few weeks has caused  Ambrosia ambrosiodes (canyon ragweed) and Ambrosia deltoidea (triangle leaf bursage, rabbit bush) to wither.  Cercidium spp (Palo Verde) have stopped flowering, and Mesquite trees will stop releasing pollen by the middle of June.  Flowering of Olive trees is over.  Allergenic trees that may be important locally and have been flowering in recent weeks include California Pepper Tree (Schinus molle) and  Privet trees and hedges (Ligustrum lucidum).  Schinus and Ligustrum will probably stop releasing much pollen by the end of June. Bermuda grass in alleys and roadsides mostly dried up in June, but will revive and start to flower with the monsoonal rain. 

These native plants that flower conspicuously in May and early June do NOT release significant amounts of allergenic pollen into the air:  Acacia constricta (White-thorn), Acacia Greggii (Cat-claw), Acacia farnesiana (Sweet Acacia), Prickly Pear cactus (now setting fruit), Saguaro (in full bloom in late May early June) and Cholla. 

Note:  This information is based on ongoing observation of flowering allergenic plants in the Tucson metropolitan area, and not on pollen counts.  Appearance and persistence in the air of any particular species of airborne pollen are expected to be later than the onset and duration of flowering of the plant of origin.                                                               Back


Disclaimer:   This site is for educational purposes only.  Any information that you have found in this web site is not intended to replace medical care or advice given to you by your own physicians. You should consider consulting your local medical library and other web sites for additional information. 

Comments and suggestions welcome!   Email: schumach@u.arizona.edu
Content Owner:  Michael J. Schumacher, MB, FRACP, The University of Arizona
Updated May 2013