Rocks add an aesthetic and functional element to gardens. They are often used to create dimension and add a pop of color. In other gardens, they provide plant support or are used for walkways or to prevent erosion. Unlike the organic elements in a garden, rocks require little maintenance. They do, however, lose their curb appeal after awhile. When mildew, algae and dirt accumulate, it's time to clean your garden rocks.
Mix 1 oz. of laundry detergent, 3 oz. of trisodium phosphate (easy to pick up at most home and garden centers), 1 quart of laundry bleach and 3 quarts of water in the bucket.
Remove the rocks from the garden. The best place to put them is the nearest driveway. Do not place them on the lawn. The bleach solution used to clean the rocks will kill or burn the grass.
Dip the brush in the bucket and scrub the surface of the garden rocks.
Allow the bleach solution to sit on the rocks for 10 to 15 minutes.
Scrub the rocks a second time then rinse them off with water.
Move the rocks back to your garden.