Yesterday I purchased an ornamental grass that I have never seen before. The label says Frosted Explosion, Panicum E . . . It is a small plant (2.5" pot) but has a beautiful seed head on it and I thought it would be worth trying out as a tall plant in a barrel. Does anyone know how big these grow and if they are perennial (I'm zone 5)? I googled it and find that it is being touted as a great grass for flower arrangements but couldn't find a lot about the growing habit. I am wondering if one plant will do it, or if I should hurry back to the nursery and pick up the others they had since it seems like it could be a really wonderful addition to the garden.