This is the 2723rd most frequent German word.
grüner
"Grüner" means "greener" in English.
Here, 'grüner' is used as an adjective describing the color of the apple. It agrees with the noun 'Apfel' in gender, number, and case.
Der grüne Apfel liegt auf dem Tisch.
The green apple is lying on the table.
In this sentence, 'grüner' functions as part of the noun phrase 'Grüner Tee', indicating the specific type of tea.
Grüner Tee ist gesund.
Green tea is healthy.
Here, 'grün' is used in a declarative sentence to describe a change in state or condition of the leaves.