sage green vs vert

sage green

adj
  • Of a greyish green colour, like that of sage. 

noun
  • A greyish green colour, like that of sage. 

vert

adj
  • In blazon, of the colour green. 

noun
  • A vertical surface used by skateboarders or skiers. 

  • vertebrate 

  • A green colour, now only in heraldry; represented in engraving by diagonal parallel lines 45 degrees counter-clockwise. 

  • In sport, a type of bicycle stunt competition. 

How often have the words sage green and vert occurred in a corpus of books? (source: Google Ngram Viewer )