This is a slender short bamboo that grows in the soft ground of The Wastes in a variety of colors. As the ever present winds blow across the low bamboo, a whistling noise occurs. The eerie song actually has an odd vibration to it, keeping The Varner (and some other large predators) away.
This plant could be found in other places as well, but has yet to be transplanted. In places other than the Wastes, it would simply range in color from yellow to green.