fever bush vs garget

fever bush

noun
  • American winterberry, Ilex verticillata. 

garget

noun
  • Pokeweed. 

  • An inflammation on a cow's or sheep's udder. 

  • A distemper in pigs accompanied by staggering and loss of appetite. 

How often have the words fever bush and garget occurred in a corpus of books? (source: Google Ngram Viewer )