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The Best Crab Grass Killer
The Best Crab Grass Killer. Crab grasses are members of the genus Digitaria and native to tropical and warmer climates. These slender grasses can be a problem weed in lawns and gardens, since they seed readily and can withstand unfriendly conditions. Choosing the right crab grass killer can help homeowners keep their lawns attractive and weed free.
Crab grasses are members of the genus Digitaria and native to tropical and warmer climates. These slender grasses can be a problem weed in lawns and gardens, since they seed readily and can withstand unfriendly conditions. Choosing the right crab grass killer can help homeowners keep their lawns attractive and weed free.
Mowing
Creating a dense growth of other grasses can choke out crab grass, according to Purdue University. Mow at a height of 2-1/2 to 3 inches, and mow frequently to encourage healthy turf grass growth.
Watering
Moist growing conditions are perfect for crab grass. Kill crab grass by watering infrequently and deeply, instead of on a daily basis.
Pre-Emergent Herbicides
Herbicides are considered a last resort against crab grass, since their runoff can cause significant environmental problems. When herbicides are required, use a pre-emergent product before the grass becomes established. These will kill the crab grass before it breaks the soil surface.
Post-Emergent Herbicides
Post-emergent herbicides can be used to control crab grass that has already emerged. They work best on small plants, and should be applied only on non-humid days with temperatures below 85 degrees Fahrenheit. Water well before applying herbicides.
