How to Control Weeds in the Lawn and Garden Lowe's. An example of a post-emergent is a herbicide you use as a crabgrass killer once the weed has sprouted in your lawn. All of the contact weed killers are post-emergents. Apply post-emergents later in the growing season, after weeds are established but before they have gone to seed..
How to Control Weeds in the Lawn and Garden Lowe's from i5.walmartimages.com
1. Make your own herbicide and spread it on the weeds. Make your own herbicide if you want.
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