In the Southwest region, cedar, elm and oak begin pollinating in early January and end in June. Other allergy-causing trees include the box elder and mesquite. Elm begins in late January and ends in April, and olive pollinates from mid-March to mid-April.
The grass season for this region usually begins in April and lasts until September. The primary allergenic grasses for the region are Bermuda, quack grass/wheat grass and redtop.
Weeds in the region include ragweed, chenopod and dock, which pollinate between July and October. Other allergy-causing weeds include waterhemp, carelessweed/pigweed, saltbush/scale and lamb's-quarter.
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In the Southwest region, cedar, elm and oak begin pollinating in early January and end in June. Other allergy-causing trees include the box elder and mesquite. Elm begins in late January and ends in April, and olive pollinates from mid-March to mid-April.
