Weeds on patios and driveways can be a persistent problem for homeowners, especially those with block paving. To combat this, experts recommend a natural solution: sand. First, it's essential to remove existing weeds by hand or using methods like a white vinegar solution or boiling water. While chemical weedkillers are an option, they can harm beneficial insects, so manual removal is preferable. Once the area is weed-free, applying sand into the joints between paving blocks can prevent future growth. Specialized products like Dansand Joint Filling Sand, which is a mixture of quartz sand and nutrient-poor minerals, create a dry environment that is inhospitable to weeds while remaining water-permeable. Another effective option is moisture-cured jointing compounds that can be easily swept into the joints and set with water. These methods not only inhibit weed growth but also repel insects, making them ideal for patios and driveways. For best results, apply sand during dry, sunny weather.