Piece of ground draws on water plants (7)
I believe the answer is:
lotuses
'water plants' is the definition.
(lotus is a kind of water plant)
'piece of ground draws on' is the wordplay.
'piece of ground' becomes 'lot' (lot is a kind of piece of ground).
'draws on' becomes 'uses' (I've seen this in another clue).
'lot'+'uses'='LOTUSES'
(Other definitions for lotuses that I've seen before include "bloomers" , "sports cars" , "flowers" , "Plants" , "Water lilies" .)