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These guys do the hedychium plants http://www.jungleseeds.co.uk/contents/en-uk/d133.html
Have you checked for aphids?
Can you see if it still feels well anchored into the ground, with the wet weather followed by some strong winds last year it might have loosened from the ground.
If you let it trail over the ground you can try to grow it in a spiral so it takes up less space
I think simply googling picture of stinging nettles would be slightly less painful
Or instead of using black plastic lay sheets of cardboard down then mulch deeply over it with rotted manure. See Charles Dowding and his no dig approach to weed reduction.
You could stick your hand in them and see if they sting rather than just prickle you
I save the tubes that my effervescent vitamin c tablets come in, I've seen those little yakult yogurt drink bottles used too
chives or some type of allium