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There are very few plants that do not have a helpful side. Dodder, a parasidic plant that grows on other plants and has 100 plus species, is one.

Weeds, defined as any plant that is growing in a place where it is not wanted, are other unhelpful plants; however, they may be helpful if grown in a place where they are wanted.

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Q: What are some plants that are not helpful to people?
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