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Most tricky to get rid of this from the garden, if that is your aim. It seems to re-grow from any piece of root left in the soil, it certainly does in my garden anyway.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Lat/Lng: 50.8, -0.2
OS grid ref: TQ3005