haulm vs leaf litter

haulm

noun
  • The stems of various cultivated plants, left after harvesting the crop, which are used as animal food or litter, or for thatching. 

  • Part of a harness; a hame. 

  • An individual plant stem. 

leaf litter

noun
  • Dead plant material, such as fallen leaves, bark, and twigs, that has fallen to the ground and may be used by animals as habitat or for nest-building, eventually decomposing and releasing nutrients into the soil. 

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