As the temperatures drop and we bid farewell to the warmth of summer, the pace of many things seems to slow down—including weed growth. If you've ever felt that herbicides aren't that effective in fall and winter, you aren't wrong! We've got the lowdown on why that is and what you can do to help keep your lawn weed free over Winter.
Understanding the Dynamics:
With lower temperatures all plant life experiences a slowdown in their metabolic processes. Where some plants like bermudagrass goes dormant to conserve energy, winter weeds have identified a competitive advantage in remaining active and regulating their metabolic processes on a shorter scale. Essentially, winter weeds go into a kind of stasis where decreased metabolic process reduce the energy required and thereby allow the plant to maximize its current energy stores as needed.
During this period, plants can and do still prioritize reproduction. That is how a dandelion will still product a flower under snowfall! While the metabolic speed is minimal, all of the plants energy is available for the purpose of procreation.
Killing winter weeds when temps dip is only a challenge; it's not impossible!
The Need for Patience:
The magic of herbicides lies in their ability to be absorbed by the weeds, disrupting their growth and ultimately leading to their demise. However, when weeds are in a cool season stasis of sorts, they aren't as active and the absorption of weed killers slows dramatically. This slowdown in absorption is the primary reason why it takes longer for herbicides to show results during the late fall, winter, an even early spring months.
Temperature Matters:
Temperature plays a crucial role in the efficacy of herbicides. Warmer temperatures are like a catalyst, speeding up the absorption process. In contrast, the cooler months create a less favorable environment for this rapid intake.
Tips for killing winter weeds:
Choose the Right Herbicide: Opt for herbicides specifically formulated for cooler temperatures. These are designed to work effectively even when the weeds are not in their most active state. The product label will be your absolute best source of data on this front.
Consider Liquid Formulations: Liquid herbicides have a faster action compared to coated granular formulations. No sense kicking the can any further down the road waiting on rainfall or a warm enough day to turn on irrigation!
Consider Timing and Avoid Freezing Temps: Herbicide applications work best when they are not immediately followed by a drop in temperatures below freezing. With regard to cool to cold ambient temps, heat helps. While not always feasible, herbicide application should be made during the warmest part of the day possible.
Know Your Adjuvants: While some herbicides include adjuvants to enhance absorption and action, many on the more economical side of the scale do not. Review your herbicide label for recommended adjuvants that are seasonally appropriate and will boost herbicide effectiveness.
Be Patient: Understand that patience is key during the cooler months. Results may take a bit longer to manifest, but with time and a solid plan, you'll see those weeds waving the white flag well ahead of spring!
So, there you have it—the mystery behind the delayed action of herbicides in cooler months unveiled. As we embrace the changing seasons, it's essential to adjust our expectations and approach to lawn care. Remember, a little patience can go a long way in achieving that weed-free, lush green lawn, even when the temperatures start to dip. Happy gardening!
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