Thymus "Reiter" thyme is flat and very tough and not too aggressive. T. "Doretta Klaber" is better but not as tough and less aggressive. Creme-de-menthe self sows and like moister shadier locations. Antennaria "pussy toes" are perfect for areas between grasses and are east if the Helichrysum larvae don't get to them. Laurentia __ does well between stones and my driveway. Frank Cooper Central IL. Zone 5b