Puffgrass

This small, yellow grass grows up to 1 foot (30.5 cm) tall. The stiff, pointed stalks grow in thick clumps that are prone to bending and snapping under stress and they overwhelm an area rapidly.

When mature, the end of the stem eventually transforms into a medium-sized, beige puff.

During the late autumn, it produces copious amounts of pollen; it can cause severe allergic reactions, and after flowering, it is left with lots of tiny grains.