Dollarweed aka Pennywort thrives in turf with excessive moisture. The first thing that should be done is to reduce water. Find out what is causing the water issue. Are you watering too often? Is your neighbor’s irrigation system watering your turf as well? Do you have poor drainage? Once you determine the cause of the water issue, attempt to fix it. If the excessive moisture is not corrected, you will have an on going dollarweed infestation.