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Credit: SEWilco via Wikimedia Commons

Ginkgo-perfuming season has begun.

As it does annually, the District Department of Transportation is spraying female ginkgo biloba trees this week in all eight wards—with a chemical known as Shield-3EC 24(C)—to combat their “offensive” smelling fruit. DDOT says in a release that the treatment started on Sunday at 9 p.m. and it will last until Thursday.

“Residents are advised that spraying will begin in Wards 1, 2 and 6, where female ginkgo trees are most prevalent, and continue through Wards 4, 3, 7, 8 and 5 in that order,” the department explains. “Spraying will occur during the evening for several nights. There is no need to move vehicles that are parked on affected streets.”

You can see the distribution of the ginkgo trees in the DDOT-provided map below.

DDOT notes that residents can petition for the trees to be removed and replanted with other types if they’re unsatisfied with the spraying efforts. Some have compared the smell of gingko seeds to “a mix of vomit and putrid cheese.”