Though from Portugal, Stipa gigantea is quite hardy so long as it's in well drained soil. I presume it was alive when moved? When was it moved and did you take a good rootball when lifted?

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Are yours in a lot of shade? I have one that has grown rather large beside my path and regularly attacks the postman in the morning with its fronds if I don't keep it very well trimmed back. It did not get any special attention, or feeding.

Mine gets the morning sun and is in loamy soil.