Common buckthorn spreading seed across Milwaukee region

September 21, 2026

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was recorded 27 times in the past 30 days across the Milwaukee region, with the most recent observations on 2026-09-17 in Wisconsin.¹ This introduced species is widely distributed in the area as it enters its seed dispersal phase in early fall, when its fruit becomes edible to birds that spread it further.¹ Abnormally dry conditions affecting 66.19% of Milwaukee County may reduce predation or disease pressure on this invasive shrub.¹

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