wild mustard, Sinapis arvensis

Is this the source of the condiment? Only occasionally, but enough so that it invaded along with its tastier relatives. Wild mustard or charlock is one of those species that account for the late spring yellow fields we see. It's pretty, but if you Google it, one of the first pages you'll see will Be Michigan State's "Plant and Pests Diagnostics". This is one of the worlds most widespread agricultural pests. So how has Alabama escaped? They are the only state or province that wild mustard has not been reported from. It's also on GL and SPM. Lenawee Co MI, 6/5/11.