Crabgrass can be controlled effectively through a combination of preventive and active control measures. To remove existing crabgrass, you can pull the plants by hand when the soil is moist or target them with post-emergent herbicides designed for crabgrass, making sure to follow label instructions for safe use in lawns[1]. Non-chemical means such as hoeing, mulching, and solarization are also effective in gardens and landscape beds[3].
For prevention, apply a pre-emergent herbicide in early spring, before soil temperatures consistently reach 55°F, since crabgrass seeds need warm soil to germinate[2][5]. Pre-emergent treatments are not effective once seeds have sprouted and can also prevent the germination of wanted plants, so apply accordingly[5]. An organic alternative is corn gluten meal, which acts as a natural pre-emergent if applied before crabgrass germinates[4].
Maintaining a thick, healthy lawn through high mowing (over 3 inches), regular feeding, and proper watering further discourages crabgrass by shading the soil and minimizing bare spots where weeds can establish[1][2]. Lawns that are thin or stressed are more likely to be invaded by crabgrass; thus, dense turfgrass is the most important method of sustainable control[7].
For landscape beds and gardens, mulching 2-6 inches deep can smother crabgrass seedlings by blocking sunlight[3][4]. If crabgrass is germinating in mulch, use a rake to disturb the seedlings and hand-pull those that escape. Avoid deep tilling, as it can bring buried crabgrass seeds to the surface[5].
Combine these methods—manual removal, chemical and organic preventers, mulching, and good lawn care practices—for comprehensive crabgrass management that prevents future outbreaks[1][2][4].
References
- [1] How to Get Rid of Crabgrass in the Lawn | Scotts
- [2] Managing Crabgrass in Lawns – University of Illinois Extension
- [3] Crabgrass – UC IPM
- [4] The Best Crabgrass Weed Killer
- [5] How to Control Crabgrass | Yard and Garden – Iowa State University
- [7] Best Management Practices in Spring Crabgrass Control in Lawns
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