Name: Evan Pioneer Valley south, MA, USA (Zone 6a)
Check out the Salvias (Salvia) Parent plant page @RickCorey. There we have both an article and a comment. It is the possibility of discussion/response to the article that I was referring.
Edited to say: I agree with @valleylynn, that is some informative comment on the Brassicas (Brassica) Parent plant page Rick.
