Low, woody plants (6)
I believe the answer is:
shrubs
'low woody plants' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for shrubs that I've seen before include "Low, woody bushes" , "Low woody perennials" , "low-growing bushes" , "'Woody plants, bushes (6)'" , "Low-growing woody plants" .)