I would get shot of it as well. It looks like someone's been strimming it and dead leaves have built up. Phormiums shouldn't really be trimmed like, you really need to place them where they can develop to their full potential, i.e. a Botanical garden. Too many massive ones inappropriately planted in front gardens, growing up past the first floor windows!
"What is hateful to you, do not do to your neighbour".
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