Wiktionary
n. 1 A single instance of a plant described by the mass noun grass. 2 (context rare English) A very small amount of something.
Usage examples of "blade of grass".
He picked a blade of grass and idly began to shred it between his fingers.
They seemed an impatient group to him as he joined them in the cold breath of dawn with dew glimmering on every blade of grass.
Even in the darkness he could see each blade of grass, separate and whole, all of them at once.
With the silent stealth of an experienced hunter, she followed fresh droppings, a bent blade of grass, a faint print in the dirt, and just ahead she distinguished the shape of the animal hiding in camouflaging cover.
The Imp told the queen that Stannis had better train his horses to eat ash, since he would find no blade of grass.
The sellsword rose laughing and brushed a blade of grass from his knee.
Four thousand years ago every blade of grass in the Northern Territories was ours.