This is an invasive weed. I thought the orange chinese lanterns would add interesting colour and texture to the red bed at the end of the season as the orange lanterns go brown and cobwebby around the edible fruits - and they did the first and second years. But this plant spreads underground like the most invasive weeds. Like them, each broken bit becomes a new plant so you can't leave a scrap in the ground. It is a complete nightmare and buries itself in the roots of roses and other plants. I spent lots of 2011 trying to remove it and I thought I had been mostly successful but it reappeared in 2012 and again in 2013 and had even moved under the gravel path from the Hot bed to the pink bed. I can't possibly have orange in the Pink bed so I have resorted to weedkiller!  Like a number of other plants I think this one should carry an "invasive" warning on the label.