Jordan Marr from the Ruminant speaks with Jay McCaman who has spent many years observing  and cataloguing the weeds on his and his clients' farms.  Over time he's observed the soil types, conditions, and nutrient levels of the countless fields he's worked with and has come up with, well, sort of a grand unifying theory of weeds - and what they're telling us about our soil. Jay has written a few versions of his book on the topic, but the only one currently availble for sale is called, simply, When Weeds Talk. Have a listen!