I've found, the hard way, that cool season grasses (here in KY anyhow) can only be successfully transplanted/divided in early spring. When they just start to show growth. Any other time, and I've always lost the plant. I hope others have more encouraging tips or info.

The 'was it a mistake' part is obvious. Only time will tell if it survives, its not going to look good this year, that much is for sure. You will have to wait and see what comes up from the roots next year to know. Rule of thumb, never move a grass when its forming stalks or is blooming, do it when the plant's energy is focused on roots and leaves.

Last year it didn't grow any stocks, I assume as it was growing the mound and/or dormant from the garden centre. I'm not sure if I'm just used to it, but today it seems a little less 'yellow'. Could that be a reality or am I just dreaming.