Graygrass

This colossal, gray grass grows up to 35 feet (10.7 meters) tall. The very narrow and elongated stalks grow in small clumps that are light and frail.

When mature, the end of the stem eventually transforms into a small, lime flower.

During the late autumn, it produces an average amount of pollen; it does not cause many allergic reactions, and after flowering, it is left with a few medium-sized grains.