Something is taking over my lawn
Hello, I wonder if anyone can help me identify what is taking over my lawn. It started to appear about 2 months ago and has now spread right through the whole front lawn. I have used a general all purpose lawn weedkiller which had absolutely no effect on it at all. It has small, heart shaped leaves slightly larger than the size of a finger nail as you can see in the photo and each clump has about 10-15 leaves. The clumps are rampant and it is now beginning to spread to my back lawn as well. Any help in identifying and eradicating this would be very much appreciated.