Liquid Weed & Feed is manufactured by the pbi Gordon Corporation. It is an herbicide and fertilizer combined. That means while it is busy killing the weeds in your lawn, it also adds nutrients that will help your grass grow strong. Liquid Weed & Feed saves you from having to use two separate products on your lawn. Just be aware that this product is a concentrate, and must be mixed with water before it is used.
Wait for a day when there is little to no wind and no rain in the forecast. This will prevent the Liquid Weed & Feed from being swept into areas of your lawn where you did not intend for it to go.
Put on a pair of gloves and some old clothing. You may also want to wear a mask and goggles when using these chemicals.
Measure out your Liquid Weed & Feed, and pour it into your backpack sprayer.
Add the water to the backpack sprayer and mix the two ingredients together. You now have enough Weed & Feed to cover 5,000 sq. ft. of lawn.
Spray the herbicide/fertilizer across your lawn in a sweeping motion. You may want to start at the far end of your lawn and work your way back toward the front.