2 years ago I lost all my strawberries over the winter and gave up on them. that spring I found 5 plants as I was tilling and moved them to a corner of my garden and they have multiplied to an area about 4x12, and are spitting out runners that I have been putting back with the rest. I know that I'm supposed to cut the plants back in the fall but what do I do now as they seem to be done with the runners. Thanks