Different weeds will also show you what is missing in the soil. As Dave mentioned all the weeds have various rooting depths and work to fill in niches that the soil is missing. Dr. Elaine Ingham has a lot of talks on you tube about soil microbiology that are a real eye opener into why weeds are growing where and what they can tell us about what we can do to further along the soil health. I love that this podcast didn't label weeds as bad guys, they are the pioneers!
Pinterest is horrible. I work in the art field and it has completely destroyed it.
