Just to continue on the ornamental grass theme – here is an example of how common they are (photo taken somewhere near Kasi, Laos). You can see the white heads spreading all along the field here.
Here is a closer shot of the right-hand side of the above scene. I think that they are of the Pennisetum genus, possibly the Pennisetum alopecuroides. Though I wasn’t close enough to be able to see them properly. They were growing pretty high I’d say – 5-6ft.