Crushed decomposed granite is a natural material used for walks, patios and driveways. Water permeable, it is the surface of choice for both eco- and budget-conscious homeowners. Occasionally, however, grass and weeds sprout in even firmly compacted gravel. While annoying, the grass is easily dealt with if you take quick action using one of several methods.
Things You'll Need
- Weed cloth
- Corn gluten meal product or other pre-emergent herbicide
- 1 gallon white vinegar
- 2 ounces orange oil
- 1 teaspoon dish-washing liquid soap
- Glyphosate product
Lay weed cloth over the compacted soil surface before adding the decomposed granite. Weed cloth prevents grass and weeds from growing in the decomposed granite.
Apply corn gluten meal or a different pre-emergent herbicide. Corn gluten meal is a natural byproduct of milling corn for cornmeal and other products. Apply 20 pounds for every 1,000 square feet of decomposed granite, and sprinkle it with water according to its manufacturer's directions.
Spray the grass with a vinegar solution. Mix 1 gallon of white vinegar with 2 ounces of orange oil and 1 teaspoon of dish-washing liquid soap to make the solution. Thoroughly soak the grass with the mixture.
Spray actively growing grass with a glyphosate product according to its manufacturer's directions. Allow several days for the grass to absorb the glyphosate. The herbicide requires time to reach the roots and kill the entire plant.