Preventing crabgrass from spreading can be a challenging task, but with the right approach, it is definitely achievable. One of the most effective ways to combat crabgrass is by applying a pre-emergent herbicide. This type of herbicide works by creating a barrier in the soil that prevents the crabgrass seeds from germinating.
Timing is crucial when it comes to applying the pre-emergent herbicide. It is important to apply it before the crabgrass seeds have a chance to germinate. Generally, experts recommend applying the herbicide when the soil temperature reaches around 55 to 60 degrees Fahrenheit. This typically occurs when the Forsythia bushes begin to bloom or when the soil temperature reaches a consistent 50 to 55 degrees Fahrenheit for about a week.
To determine the soil temperature, you can use a soil thermometer, which can be inserted into the ground at a depth of 1-2 inches. This will give you an accurate reading of the soil temperature. It’s important to note that air temperature alone is not a reliable indicator of soil temperature, as it can vary significantly.
Once you have determined the appropriate time to apply the pre-emergent herbicide, it is essential to follow the manufacturer’s instructions carefully. Make sure to read the label thoroughly and apply the herbicide evenly across your lawn. It is crucial to cover the entire area where crabgrass is likely to grow, as missing even small patches can lead to crabgrass breakthrough.
In addition to using a pre-emergent herbicide, there are a few other practices you can incorporate into your lawn care routine to help prevent the spread of crabgrass:
1. Mowing Height: By maintaining your lawn at a slightly higher mowing height (around 3 inches), you can help shade the soil and prevent crabgrass seeds from receiving the sunlight they need to germinate.
2. Proper Watering: Watering deeply and infrequently encourages strong root growth in your desired grass, making it more competitive against crabgrass. Avoid frequent shallow watering, as it promotes shallow root growth and favors crabgrass development.
3. Overseeding: Regularly overseeding your lawn with desirable grass varieties can help fill in any bare spots and create a dense turf, making it harder for crabgrass to establish.
4. Healthy Lawn Practices: A healthy, well-maintained lawn is more resistant to crabgrass invasion. This includes regular fertilization, proper aeration, and addressing any underlying soil issues.
5. Hand Pulling: If you notice any crabgrass plants starting to emerge, it is important to address them immediately. Hand pulling can be effective for small patches or individual plants, but make sure to remove the entire plant, including the roots, to prevent regrowth.
By combining these preventive measures and using a pre-emergent herbicide at the right time, you can significantly reduce the spread of crabgrass in your lawn. Remember to always read and follow the instructions on the herbicide label, as each product may have specific recommendations and precautions.
