Ornamental grass ID

in Plants
Does anyone know this one? Ignore the red leaves at the base - that's an oxalis growing in amongst it. My mother had it in a pot. I planted it in the garden and it's grown o nearly 2m tall, about a foot diameter. Doesn't self seed. Hardy. Evergreen (well, dark purple). I've dug it up because it's far too big for where I'd put it (hence it currently being in a bucket). Before I try to divide it and replant it, I'd like to ID it in the hope of not making the same mistake twice.






“Light thinks it travels faster than anything but it is wrong. No matter how fast light travels, it finds the darkness has always got there first”
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"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
When you don't even know who's in the team
S.Yorkshire/Derbyshire border
We all want to help forum members but do need as much detail as possible to help.
Hope the other suggestions are useful
Far too late now and, in my experience, grasses sulk and die if you do it in autumn and I wouldn't risk it now when it's in full flower so try and give it a bigger pot or a temporary hole with some decent soil and lots of water. Looks parched.
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
The South African website says these don't like being divided, so that could be a really good save - thank you
K67 - if I'd known it was relevant, I'd have said it. The trouble with having no idea what a plant is, one has no idea what it's defining characteristics may be.