I'm one of those people who's damn near allergic to everything — or at least, according to my doctor, to all forms of dust and tree pollen, which might as well be everything. This was particularly frustrating at the start of the COVID-19 outbreak this spring, as every day I woke up with a scratchy throat or runny nose I immediately assumed the worst. (Don't worry, I'm fine; it was allergies every god damn time.)
While I tend to thrive better in cities that offer some respite from our botanical oxygen-pooping friends, I recently learned that American urban planning generally favors male trees, which produce more pollen. From Atlas Obscura:
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[W]hen [Tom Ogren, horticulturalist and author of Allergy-Free Gardening: The Revolutionary Guide to Healthy Landscaping] studied frequently landscaped plants in other cities, he noticed the same thing: males, all the way down. “Right away I started realizing there was something weird going on,” he says. While tracking down the origin of this trend, Ogren stumbled upon perhaps the first trace of sexism in urban landscaping in a 1949 USDA Yearbook of Agriculture. The book advised: “When used for street plantings, only male trees should be selected, to avoid the nuisance from the seed.”
Urban forestry’s apparent sexism seems to boil down to our distaste for litter. The USDA reasoned that tiny allergenic spores are likely to be blown away by wind or washed away by rain, making pollen an easier civic task to manage than, say, overripe fruit or heavy seed pods that would need to be cleaned up by actual humans.