creeping Charlie vs field balm

creeping Charlie

noun
  • Swedish ivy (Plectranthus verticillatus), in the mint family, a popular houseplant 

  • creeping Charlie (Pilea nummulariifolia), a houseplant in the nettle family 

  • ground ivy, Glechoma hederacea 

  • moneywort 

field balm

How often have the words creeping Charlie and field balm occurred in a corpus of books? (source: Google Ngram Viewer )