good reference book for identifying non-natives
I have a few different woodland and prairie/savanna native areas I'm working on. I'm always after the invasives particularly in this savanna area that I just planted from seed last year. Some things I know are non-native invasives but some things I'm not so sure so I'm leaving those. In particular I really need to figure out what grass is good and what is not - I do know which is reed canary grass but not sure about some others.
Does anyone know of a good book with photos to help identify invasives found in Minnesota? I've found some decent books that identify mature native plants but nothing that's got much to help me confirm what's a weed and what's not at this point.