When you think of unwanted plants, things like dandelions, quack grass and other common weeds that bully their way into your yard and garden probably come to mind. But occasionally, we inadvertently plant a seedy character that takes over the garden, gets you itching or causes a whopper of a stomach ache (or worse) if eaten.
Here are the worst irritating, poisonous and invasive plants — the ones you should always avoid.
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