horsemint vs nettle-leaf giant hyssop

horsemint

noun
  • An aromatic plant of the mint family, Agastache urticifolia. 

  • A coarse American plant of the mint family (Monarda punctata). 

  • Wild mint (Mentha sylvestris, now Mentha longifolia). 

nettle-leaf giant hyssop

noun
  • An aromatic herb of the western US in the mint family (Agastache urticifolia), used medicinally by the American Indians. 

How often have the words horsemint and nettle-leaf giant hyssop occurred in a corpus of books? (source: Google Ngram Viewer )