Blame the paTREEarchy? The answer is more complicated than any TikTok or tweet thread you may have seen can convey.
Later in that piece, Ogren says that to stop what he calls the “allergy epidemic,” he recommends planting female trees, which “trap and remove large amounts of pollen from the air.” Local communities could also take up pollen ordinances and avoid planting pollen-heavy trees; to determine pollenicity, he offers up OPALS, a pollen-rating scale he created in 2000.
globally, only about 5 percent of trees are dioecious; the rest are monoecious, cosexual, or polygamous, meaning a single tree can have both maleAlso, there’s no vast conspiracy to plant only male trees, Taber says. She sent me a link to the 1949 USDA Yearbook.
. The next sentence describes how those seeds clog sewers and drainpipes, and that, in general, cottonwoods have weak wood and one should avoid planting them on any streets, lest a strong storm take a tree down.As for whether planting female trees could help, Taber is a hard no. “Pollen is so cheap that trees can afford to make extra. Like, a LOT of extra,” she writes.
First, let’s consider the claim that male trees are more prevalent than female trees in the urban landscape. Unfortunately there is very little solid data on this, and what I was able to find actually originates with Ogren, who was paid to do an allergy assessment of several Canadian cities. At the time, there were some local media stories about it; for instance, Vancouver’s city planner says that
. Still, that only includes city-planted trees; individual homeowners plant trees, too, and many trees predate modern cities.What Taber claims is true, says Sousa Silva—but the trees that are planted in urban areas are a small subsample of what exists in nature, so therea chance that there are more male trees in cities. Even dioecious trees can be cultivated to lack “female” qualities, like dropping messy seeds and inedible fruit.
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