How to Kill Crabgrass in Centipede Lawns

Centipedegrass lawns grow best in USDA hardiness zones 7 through 10, but they are susceptible to invasion by crabgrass, an invasive summer annual grass. To control crabgrass in your centipedegrass lawn, consider using a combination of cultural practices, such as mowing high, proper irrigation, and hand-pulling, in conjunction with targeted herbicide applications. Here's a comprehensive guide to help you eliminate crabgrass from your centipedegrass lawn:

1. Mowing Practices:

- Mow your centipedegrass lawn at a height of 3 to 4 inches. Taller grass blades help shade the base of the turf and discourage crabgrass growth.

2. Proper Watering:

- Water deeply and infrequently to encourage deep root growth in the centipedegrass. Avoid frequent, shallow watering, which encourages weed growth.

3. Fertilize Wisely:

- Apply a slow-release, nitrogen-based fertilizer according to the centipedegrass's specific requirements. Do not over-fertilize, as excessive nitrogen can promote crabgrass growth.

4. Hand-Pull Crabgrass:

- Manually remove crabgrass plants by hand-pulling them from the ground before they have a chance to produce seeds.

5. Pre-emergent Herbicides:

- Apply a pre-emergent herbicide in early spring before crabgrass seeds germinate. Follow the product instructions carefully for proper application rates and timing.

6. Post-emergent Herbicides:

- If crabgrass has already germinated and established itself in your lawn, you can use a selective post-emergent herbicide labeled for use on centipedegrass. Choose a product that specifically controls crabgrass without damaging your centipedegrass.

7. Spot Treatment:

- For spot treatment of crabgrass, you can use a glyphosate-based herbicide. Make sure to target only the crabgrass while avoiding contact with the centipedegrass.

8. Minimize Thatch Buildup:

- Thatch buildup can provide a favorable environment for crabgrass growth. Dethatch your lawn regularly to remove excess thatch and promote better air circulation.

9. Over-seeding:

- Over-seed bare or thin spots in your centipedegrass lawn to prevent crabgrass from establishing.

10. Maintain Healthy Lawn:

- A healthy, dense centipedegrass lawn is less susceptible to crabgrass invasion. Regularly monitor the lawn for signs of nutritional deficiencies, disease, or pest problems, and address them promptly to maintain turf health.

11. Monitor and Repeat:

- Crabgrass can be persistent, so regular monitoring and repeat treatments may be necessary to fully eliminate it from your centipedegrass lawn.

Remember, it is always a good idea to read and follow the specific instructions and precautions provided on the herbicide product labels before use. If you are unsure about the appropriate herbicide for your lawn or have any questions about crabgrass control, consider consulting a lawn care professional or contacting your local cooperative extension office for guidance.