Maintaining a lush, green lawn in the warmer months requires strategic planning, especially when it comes to weed control. For homeowners and groundskeepers managing Bermuda grass, the battle against crabgrass and other invasive broadleaf weeds begins long before the first sprout appears. The most effective defense is often a pre-emergent application, and Scotts has established itself as a leading solution in this critical category.
Understanding the Science Behind Scotts Pre-Emergent
To appreciate the effectiveness of Scotts pre-emergent for Bermuda grass, it is essential to understand how these products function. Unlike post-emergent herbicides that target visible weeds, pre-emergent agents create a chemical barrier in the soil. This barrier inhibits the germination of weed seeds, preventing them from establishing root systems. The active ingredient, typically Prodiamine or Dithiopyr, disrupts the cell division of young weed seeds, ensuring they never break the surface. Timing is critical, as the barrier must be in place before soil temperatures reach the threshold that triggers weed germination.
Optimal Timing for Application
Spring Soil Temperatures
The success of any pre-emergent program hinges on application timing. For regions with warm-season grasses like Bermuda, spring application is standard. You should apply the product when soil temperatures consistently reach 55 to 60 degrees Fahrenheit. A reliable method to gauge this is to track the blooming period of local trees; when forsythia flowers begin to fade, the soil is usually warm enough to apply. Applying too early allows weeds to germinate before the barrier forms, while applying too late allows seeds to activate.
Fall Considerations
In some climates, a second application in the fall can provide winter and early spring weed control. This is particularly useful for preventing weeds like annual bluegrass. However, for pure Bermuda grass lawns focused on summer color, the spring application is generally the most critical. Always refer to the specific instructions on the Scotts product label, as rates and timing can vary based on the specific formulation.
Product Selection and Features
Scotts offers a range of pre-emergent options tailored to different needs. When selecting a product for Bermuda grass, look for specific formulations designed for warm-season grasses. Some products are blended with fertilizer, providing a dual-purpose application that green up the lawn while preventing weeds. Key features to consider include the duration of the barrier, which can last from 4 to 6 weeks up to several months, and the spectrum of weeds controlled. Choosing the right product ensures you get maximum efficiency without compromising the health of your Bermuda turf.
Application Techniques for Even Coverage
Proper application is just as important as choosing the right product. For granular products, a broadcast spreader is recommended to ensure even distribution across the entire lawn. Walk at a consistent pace and overlap paths slightly to avoid missed strips. After spreading, lightly water the lawn to activate the chemical barrier. This irrigation step is crucial, as it moves the product from the leaf surface into the soil where it needs to be to stop weeds. Avoid heavy watering that could wash the product too deep into the soil profile.
Maintaining Lawn Health Post-Application
Once the pre-emergent has been applied, the lawn requires specific care to recover and thrive. Mowing should be done regularly, but the height should be raised slightly to encourage deeper root growth and reduce stress. Because the root system is actively developing, adequate irrigation is essential, especially during dry spells. Overseeding Bermuda grass immediately after a pre-emergent application is not recommended, as the barrier will also prevent the grass seeds from germinating. Plan any aeration or overseeding for the fall or the following spring to ensure the lawn remains thick and competitive against weeds.
