Put these unwelcome guests to work and let them tell you what's wrong with your garden.
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There's nothing more frustrating than walking into your backyard only to see the volunteer plants (the weeds) doing better than the ones you signed up for the job. The good news: Those uninvited guests can tell you just what's wrong with your garden. Even though such a "diagnosis" isn't an exact science, weeds can reveal some soil problems if you know what to look for.
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