Looks like phragmites to me, but can't really tell from pic.
DO NOT USE whatever it is until you find out for 100% what it is. Most invasive species (like phragmites) is illegal to use as blind materials if one is cutting it and moving it elsewhere. If you want to avoid a potential hefty fine, research laws regarding invasive species AND identify whatever materials you may use for blinds. Not trying to be a party pooper, but aside from a fine, you could turn your prime duck hole into a useless spot choked out with whatever invasive plant you brought in as blind cover last season
Pro Staff to nothin'
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I just do it.......Duckin' Crazy!
They say there is "a fine line between genious and insanity". That's the line I live on.