Simply pour 2 cups of CLUB SODA directly in the center of a fire ant mound. The carbon dioxide in the water is heavier than air and displaces oxygen which suffocates the queen and the other ants. The whole colony will be dead within about two days. Each mound must be treated individually and a one liter bottle of club soda will kill 2 to 3 mounds.
The newspaper will prevent any grass and weed seeds from germinating, but unlike fabric, it will decompose after about 18 months. By that time, any grass and weed seeds that were present in the soil on planting will be dead. It’s green, it’s cheaper than fabric, and when you decide to remove or redesign the bed later on, you will not have the headache you would with fabric.