- 1). Spread a pre-emergent herbicide onto your lawn a month prior to summer. This is when crab grass starts to grow. It is important that you use a pre-emergent herbicide designed for use with your type of grass. If you do not know what type of grass you have in your lawn, take a few clippings to your local lawn and garden center. They can help you select the correct product for your grass.
- 2). Pull small patches of crab grass out of the dirt by its root system to prevent smaller patches from spreading.
- 3). Spray crab grass killer such as Asolox or Asulam over larger areas. These types of herbicides are designed to kill crab grass but do minimal damage to standard yard grasses.
- 4). Aerate the dirt in areas where you killed crab grass with a metal lawn rake. Plant fresh grass seed in the bare area and around the surrounding areas of grass. A lawn full of grass will not allow room for crab grass to grow.
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