Cogon grass is a perennial plant with long and deep rhizome under the ground. Its leaves are upright, hard, veined with shape of sharp, long and narrow.
The flowers are white like cotton, very light. Apart from propagating through the root buds, the flower has the ability to spread very far thanks to the wind.
There are a series of Cogon grasses flower images near the Forbidden Purple City in Hue Citadel: