Though this grass would not be firm enough to clean a bottle, it certainly looks like a bottle brush.

It is medium-sized grass: 60 cm – 1.5 m in height.

Bottlebrush grass is found in June – August.

It has fairly large V-shaped flower clusters with long stiff bristles.

Bottlebrush Grass grows in rich deciduous or mixed forests and river banks, especially in wet areas in beech-maple-hemlock stands and in swamps.

It is native to eastern North america.

The stem leaves are fairly wide.

Miles Hearn