Plant trees, reportedly (5)
I believe the answer is:
furze
'plant' is the definition.
The answer is an example.
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for furze that I've seen before include "Dreamlike" , "Spiny shrub" , "ground cover" , "one shrub" , "Another word for gorse" .)