I have a yard full of weeds...Wild violets, wild strawberry, dandelion, chickweed you name it...Help me please ...Do I need to cut the grass I have before trying any type of weed killer? St. Louis, MO
If your lawn is more than 50% weeds, it may be best to completely renovate it, and start over by killing off everything then reseeding or resodding.
If the lawn is salvageable, you can mow as you usually would, then apply the broadleaf weed killer. Don't apply the weed killer then mow immediately or you may cut off the herbicide before it has a chance to be taken up by the weeds.