cherry plum vs petunia

cherry plum

noun
  • Prunus cerasifera, a deciduous ornamental Eurasian shrub or small tree, having white flowers and small red to yellow edible fruits. 

  • The fruit of such a tree. 

petunia

noun
  • A dark purple colour, like that of some petunia flowers. 

  • Any of the flowering plants of genus Petunia, of which most garden varieties are hybrids. 

  • a homosexual 

adj
  • Of a dark purple colour, like that of some petunia flowers. 

How often have the words cherry plum and petunia occurred in a corpus of books? (source: Google Ngram Viewer )