Concrete Gap Filler : pinner said, "Never weed again! This is what parks and public places use. Available at Lowes and Home Depot in different colors in the concrete dept. Make sure it says "Self-Leveling" concrete crack filler!
Baking soda neutralizes the ph in the soil and is a natural weed killer. Sprinkle baking soda around all of the edges of garden areas to keep the grass and weeds from growing into flower beds. Just lightly cover the soil twice a year – spring and fall.