garden hose vs garden-hose

garden hose

noun
  • A length of hose as above, usually with a male connector on one end and a female connector on the other end, which can carry water from a hose bib (a water faucet or spigot usually located on an exterior wall of a house or other building) for use on a garden or lawn. 

  • A type of hose used for light residential applications such as watering lawns or gardens, or washing and rinsing passenger vehicles, etc. 

garden-hose

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