Graygrass

This giant, gray-green grass grows up to 32 feet (9.8 meters) tall. The sickle shaped stalks grow in sparse patches that are flexible and they are slow to spread and grow.

When mature, the end of the stem eventually transforms into a medium-sized, grey spikelet.

During the mid-summer, it produces copious amounts of pollen; it does not cause any allergic reactions, and after flowering, it is left with lots of large grains.