Stopping weeds before they even break the surface is the secret to a pristine lawn. Pre-emergent herbicides form a chemical barrier in the soil that prevents weed seeds from developing into mature plants, saving you time and frustration later in the season.
Understanding Pre-Emergents
Pre-emergents do not kill existing weeds; they stop seeds from germinating. This makes timing the most critical factor in their application. If applied too late, after the seeds have sprouted, the treatment will be ineffective.
Timing Your Application
For spring weeds like crabgrass, pre-emergents should be applied when soil temperatures reach about 55 degrees Fahrenheit for several consecutive days. For winter weeds, a second application in early fall is necessary to catch seeds before the colder months.
Proper Application Techniques
Even coverage is essential. Use a broadcast spreader for granular pre-emergents, ensuring no gaps in the barrier. After application, most products require watering in. Half an inch of water helps push the herbicide into the soil where the seeds reside.
Combining with Aeration
If you plan to aerate your lawn, do so before applying a pre-emergent. Aerating afterward will puncture the chemical barrier, allowing weed seeds to sprout through the holes. Plan your lawn care schedule accordingly.
Let the Pros Handle Your Weed Control
Timing pre-emergents perfectly can be challenging. Let Dr. Green handle your seasonal treatments for a guaranteed weed-free lawn.
Get a Quote from Dr. GreenLong-Term Weed Prevention
While pre-emergents are powerful, they work best alongside good cultural practices. Keeping your mower blade high and watering deeply encourages deep grass roots, naturally outcompeting any weeds that manage to breach the chemical barrier.