zonal geranium

American  

noun

1. a widely cultivated plant, Pelargonium hortorum, having white, pink, or red flowers and rounded leaves that are sometimes banded or blotched with contrasting colors.

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Etymology

Origin of zonal geranium

First recorded in 1905–10

Example Sentences

Japanese beetle damage costs horticulture hundreds of millions of dollars annually, but since the zonal geranium phenomenon was first described in the 1920s, the paralytic agent had not been identified.

From Science Magazine

Like the common or Zonal geranium, the ivy-leafed section has within the last few years been greatly improved.

From Project Gutenberg