Poison ivy is a three-leafed vine or low shrub with greenish flowers and white berries that grows mainly in Ontario, Quebec and all US states east of the Rockies except North Dakota. It appears harmless but can cause serious skin reactions. Its relatives -- poison oak, which grows as high as six feet, and poison sumac, which grows mainly in swampy woods or shrub swamps -- all contain urushiol (toxic oil) and can cause the same skin reaction.
Whether you're trimming hedges, mowing the lawn or working on a building project, keep these yard safety tips in mind:
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