For many uses, mixing 1 1/3 ounces of Crossbow concentrate into 1 gallon of water, which makes a 1 percent solution, is enough to be effective. Stubborn weeds or brush may require a 1.5 percent solution made by mixing 2 ounces of concentrate into a gallon of water. Tough perennials or woody plants may require more concentrated solutions, up to 5 1/3 ounces of concentrate in a gallon of water.
Crossbow weed killer has a low toxicity, which gives it the ability to kill weeds without harming most species of turf grass. Crossbow is effective against shrubs, broad-leafed weeds and other undesirable plants. The chemicals used in the weed killer stop weeds from growing almost immediately, but it can take several days for the weeds it's sprayed on to die. Two applications may be required to kill tougher plants.
Crossbow works best when the plant is putting out new growth. Spray the weeds thoroughly, but not to the point where the mixture drips off of them. When applied, the upper and under parts of the foliage, stems and twigs should be coated with the solution. To insure the solution is properly mixed, agitate it in the sprayer tank occasionally. Although it will not harm most types of turf grasses, do not use Crossbow around flowering plants, fruits or vegetables.