blue bonnet vs wild chicory

blue bonnet

noun
  • A blue Australian parrot, especially Northiella haematogaster. 

  • Any of several blue flowering plants, especially cornflower, Centaurea cyanus, and plants of the genus Scabiosa. 

  • A traditional flat Scottish hat made of blue wool; a blue tam-o'-shanter. 

  • Someone who wears such a hat; a Scotsman, especially a Scottish soldier. 

  • Any of several North American species of Lupinus common in the southwestern US, especially Lupinus texensis and Lupinus subcarnosus. 

wild chicory

noun
  • common chicory, Cichorium intybus 

How often have the words blue bonnet and wild chicory occurred in a corpus of books? (source: Google Ngram Viewer )