Velvety ground cover
I believe the answer is:
moss
'velvety ground cover' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for moss that I've seen before include "Small flowerless plant(s)" , "Spore-bearing plant; bog" , "Parasitic plant" , "Plant(s) not wanted on lawns" , "Shape of pointed arch" .)