Ornamental Grass

I got a little sample of this grass at the Royal Hghland Show 6 years ago.
Year 1 - it grew well and was a decorative adornment to the garden
Year 2 - 2 plants and more structure
Year 3 - dozens of plants some even at the far side of the garden!
Year 4 - dug out, repotted and resited x 1
Year 5 - now the dogs are allowed to pee on it and it still survives....grrrrrrrrr

all seed heads removed daily - anyone want one?