Have I killed it?

in Plants
Hi, we planted 2 purple fountain grasses last year and they did really well. When I bought them, the man at the garden centre said don’t cut it back until the spring. So I left them over winter and cut them back about 3 weeks ago, but nothing seems to be happening every thing around them is doing really well but these dead. Am I being impatient or have I killed them. Thanks in advance.

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They aren't hardy unless you're in a very warm part of the UK with no frost, and even then...
I live in west central Scotland - not where that photo is...
I live in west central Scotland - not where that photo is...