Well, I'm not a taxonomist, so I don't know what species of grass this is, but it looks like the seed heads come from a rather tall type of field grass, something 2-3 feet tall. I don't think you would want to try growing it, besides, you would still need to find the seeds! Do you have a local craft store, like a Michael's or Hobby-Lobby, that is where I would look. Most craft stores have a large selection of dried flowers and ornamental grasses. I'm sure I've seen stuff like this in Michael's, though surely not in the right colors.