Definition of tree heath:
(n) :
The flowering plant Erica arborea, native to east Africa and the Mediterranean.
(n) :
Other plants of genus Erica of similar habit
(n) :
Similar plants of other genera in family Ericaceae,
(n) :
especially Trochocarpa laurina of Australia and New Zealand.
(n) :
Erica scoparia (green heath, besom heath, broom heath)
(n) :
Dracophyllum arboreum (Chatham tree heath)