Wondering if anyone out there can help me with a problem plant. Like, possibly, a lot of people I bought a little plant a couple of years ago and lost the label. Was informed by the seller that it was a 'littlle ground cover plant' and would do the job very well (read that as conquer the world!) It is a low growing little thing - only a couple of centimetres tall with chocolate coloured fern-like leaves and, apparently, small 'towers' of red flowers. It spreads by underground runners and is now in danger of taking over the border I mistakenly planted it in. I've tried hoeing it in, pulling it up painstakingly by hand and smothering it with mulch but to no avail. It keeps coming back! Can anyone identify the culprit for me and suggest a way of killing it off, please.