bramble vs tree heath

bramble

noun
  • Any thorny shrub. 

  • A cocktail of gin, lemon juice, and blackberry liqueur. 

  • The soft fruit borne by the species Rubus fruticosus formed of a black (when ripe) cluster of drupelets. 

  • Any of many closely related thorny plants in the genus Rubus including the blackberry and likely not including the raspberry proper. 

tree heath

noun
  • Dracophyllum arboreum (Chatham tree heath) 

  • The flowering plant Erica arborea, native to east Africa and the Mediterranean. 

  • Erica scoparia (green heath, besom heath, broom heath) 

  • especially Trochocarpa laurina of Australia and New Zealand. 

  • Other plants of genus Erica of similar habit 

  • Ecological domains characterized by large numbers of such species of ericaceous plants. 

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