The Garden Bug: Pollen problem
By Brenda Weaver
Only a relatively small number of plants are responsible for the allergies of millions of people in North America every year. Listed below are some of the "pollen factories" most likely to cause itching, sneezing, watery eyes, coughing, nasal discharge and headaches.
Ragweed: throughout North America
Mountain cedar: Arkansas, Missouri, Oklahoma, and Texas
Ryegrass: throughout North America
Maple: throughout North America
Elm: throughout most of North America
Mulberry: throughout the United States
Pecan: Southern states in the U.S.
Oak: throughout North America
Source: www.healthline.com