A viral clip online likely shows the catkins, or flower spikes, of poplar trees covering cars in northern China, not a “rain of worms” as social media posts and some news reports have claimed, experts told Reuters. One tweet saying: “China citizens told to find shelter after it looked like it started to rain worms” has been viewed more than 18 million times at the time of writing (here). There can be thousands of poplar catkins per tree, Claire Thomas Federici, a botanist and plant geneticist at the University of California, Riverside (here), said by email. China has a “distinctively rich” variety of trees in the poplar family, particularly in northern China, according to the U.N. Food and Agriculture Organization (here), (here). Experts say the video from China likely shows catkins from poplar trees instead of a “rain” of worms or caterpillars.

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