Pre-emergent herbicides are used to prevent weeds from growing in your yard or on your property. They come in a liquid form to be applied with a sprayer and a granule form to be applied using a spreader.
Timing is key to pre-emergent herbicide success. They must be applied prior to the target weed seeds germinating. Depending on the region you live in, pre-emergents should be put down in the fall between September and October, and before spring green up between February and March. You should apply pre-emergents before the soil reaches 55 plus degrees. Since timing of the application will vary based on weather, soil temperatures and region, you should contact your local cooperative extension office to find the best timing in your area.
The protective barrier typically lasts for up to 12 weeks. This means that any new weed seed that is brought in after the 12 week period by animals, wind or other methods, will not be prevented from growing.
If you put the pre-emergent down too soon, you risk the 12 week barrier being ineffective to newly developing seeds. If you put the pre-emergent herbicide down too late, the weed seeds could have already fully germinated making the pre-emergent ineffective.
It is very important to fully read the product label of the pre-emergent herbicide you have selected to make sure your target weeds are listed and to make sure your timing is correct.
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