‘Tis the season for aggravated allergies. You may have noticed that when the yuletide season rolls around, so do heightened allergy symptoms: sneezing, coughing, itchy eyes, runny nose, even exacerbated asthma. Not to be a Grinch, but it is possible your Christmas tree is to blame. While some people have allergies to pine and cedar pollen, pollen-related allergic reactions to Christmas trees are likely due to fall weeds, whose pollen accumulates on the trees as they wait to be sold. “Christmas trees are cut down well in advance of the Christmas season, so the tree pollen has blown away by the time Christmas comes,” says Dr.