The plant known as the corpse flower is expected to bloom some time Friday.
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The event, which only happens about once every 10 years, results in a putrid smell often compared to rotting flesh.
The flower is known scientifically as Amorphophallus titanum and more casually by gardens staff as "Rosie."
Despite the smell - or perhaps because of it - Rosie is quite popular, with hundreds visiting the flower even before it blooms. The bloom is expected to last about 24 to 36 hours.
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In Southern California, the Huntington Library and botanical gardens has a corpse flower, where it last bloomed in 2014.