When you cut the grass, use a grass catcher to catch all the seeds and take to the dump................there is an herbicide that you could use in the winter when the animals are safe tucked away for the cold weather. another thing is you have a lot of ground..........at first site of it.....hoe it down and bag & trash, a second way is to cover one area for a week with a heavy tarp and put rocks on it to kill them..........they pull them out..........or pull out by hand.....invite friends over and have a creeping charlie pulling picnic and right into a bag or box and get rid of them.........the seeds keep them going from the blue flowers.