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 Since problem weeds tend to vary from one place to another it is usually best to select reference books that cover your home region. In the US and Canada the following guides are suggested. Believe it or not weeds can be a benefical part of your garden. Weeds often support important natural enemy, or beneficial, insect and mite populations. In a sense they serve as "nurseries" for these beneficial groups. Leave some weedy, natural areas in your landscape and they will pay you back with free pest control. Highly invasive weeds, however, should always be managed.
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