petunia vs plum blossom

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. 

plum blossom

noun
  • The blossom of the tree. 

  • A tree, Prunus mume, native to East Asia bearing an apricot-like fruit; the Japanese apricot or Chinese plum. 

  • Used other than figuratively or idiomatically: see plum, blossom. 

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