mulberry vs petunia

mulberry

adj
  • Of a dark purple color tinted with red. 

noun
  • Any of several trees, of the genus Morus, having edible fruits. 

  • The fruit of this tree. 

  • A dark purple colour tinted with red. 

petunia

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

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

  • a homosexual 

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

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