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No these sort (old pic from the back garden ones).
They need to be split every so often. Plus when we had the front redone I just chucked them back wherever, so now the plants I've put in for winter interest are establishing I need to tidy up. Well I want to tidy up and now is a good time to split and move them while the ground is warm.
It's surprisingly hard to find images of how to group them in a good looking way.
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Yellow Flag irises?
They thrive in damp to wet to inundated ground.