For decades, Ogren has researched the allergy-potential of all the commonly used horticultural plants. His studies have confirmed male trees are being favored over female trees which is making allergies worse – a process otherwise known as botanical sexism. “They do that because the female trees will drop seed pods, or seeds, or flowers or maybe a fruit of some sort on the sidewalks, and they want to have clean, tidy sidewalks. That’s what’s […]