hotbed vs orangery

hotbed

noun
  • An environment that is ideal for the growth or development of something, especially of something undesirable. 

  • An iron platform in a rolling mill, on which hot bars, rails, etc., are laid to cool. 

  • A low bed of earth covered with glass, and heated with rotting manure, used for the germination of seeds and the growth of tender plants, like a miniature hothouse. 

orangery

noun
  • A greenhouse in which orange trees are grown. 

  • A garden or plantation where orange trees are grown. 

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