Not a single weed grew inside the walls.
Not a blade of grass nor a single weed marred the space between the walls.
Not a single weed could be seen on the dead brown earth.
There was no grass upon it, not a single weed, not a bush or tree.
Fallen leaves got swept up immediately by servants, and there wasn't so much as a single weed or blade of grass to be seen.
You can devote your life to pulling out each single weed as it comes up--and then ten lifetimes won't be enough for the job.
She would work in the garden for now, so she could leave it in absolutely perfect shape, without a single weed or faded bloom.
The first sign usually appears in the grass - a single weed, perhaps, left unplucked.
There is not even a single weed there!
She has not tugged on a single weed, and her strawberries have turned moldy.