Window boxes filled with vibrant flowers are a welcome sign of spring. But when it rains, the soil in them often spatters, dirtying windows and sills. To prevent the muddy splashes, spread river stones (available at garden centers) in a layer over the tops of the flower beds. The stones will act as a barrier while keeping the soil moist for the blooming plants.
Rock-Lined Flower Bed
Martha Stewart Living, April 2008