I need a natural screen.. Can't stand the deadbeat 28 year "kid" who still lives at home still and smokes and stares all day from his mom's patio.. total creep.. so, in lieu of committing a crime, I'd like to grow something that will give me coverage for at least part of the year... I could also try something other than a grass, but the giganteus apparently reaches 10+ feet.. Is this with the flower heads or just blades? How big would this thing get in ideal conditions?

thanks..