There are two types of weed controls: post emergent herbicides and pre-emergent herbicides. Pre-emergent weed controls attack the weed when it is a seed. Post-emergent weed controls attack weeds that are already visible or mature. Both of these weed controls work to fight the same kinds of weeds, but have very different application processes, so be sure to read the instructions carefully.

The best way to fight weed infestation is to use both pre-emergent weed killer and post-emergent weed killer. The pre-emergent will fight off seeds and prevent large outbreaks. If any weeds make it through the prevention stage, you can fight them off with post-emergent herbicides.

Preparing to Spray

If you've discovered weeds and you're planning on spraying a post-emergent weed control, don't mow the lawn for a while before spraying. Weeds hate tall grass and you can use this to your benefit while you're spraying. Don't disturb your lawn for 48 hours after spraying and don't mow your lawn immediately to ensure that the herbicide has a chance to work.

When you're spraying pre-emergent herbicides, you'll need to have the grass cut. This is so that the herbicide can reach the weed seeds at soil level. That doesn't mean, though, that you can spray a pre-emergent weed control right after your lawn has germinated. After planting your lawn seeds, always wait until you have cut the lawn three or four times before spraying a pre-emergent herbicide. Always remember to water the area after spraying pre-emergent herbicides. In order for the weed control to work, the area must be watered.