flowering vs upgrowth

flowering

noun
  • The period of time during which someone or something is at its peak. 

  • The period of time during which a plant is in flower. 

adj
  • Of a plant, that produces flowers. 

  • aflower, in bloom 

upgrowth

noun
  • The process or result of growing up; progress; development. 

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