Invasive plant eradication

Hi peoples,

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. 

Are you against using a weedkiller?

Sorry, no picture and no, not too worried by the idea of a weedkiller provided it wouldn't kill off the other plants in the border. My invasive friend is growing in amongst and through plants that I wouldn't like killed off.

My suggestion is to apply Roundup to the leaf area-it now comes in a gel form but only kills the plant and it goes down to the root-can take 2/3 weeks to work but does not harm the soil in anyway and will not damage other plants.

Thanks for that - I'll give it a try. It will have to wait for a couple of weeks, though, 'cos I'm going on holiday on Saturday but will make a note to get some and then attack the little so and so.

Thanks again.