Weed control in the lawn is extremely important if you are one of those home owners going for a uniform look. Growing grass that is thick and well established keeps weeds from growing, and weed control begins with proper lawn establishment. Weeds, according to the University of Missouri, are opportunists and attack a weakened lawn. Proper cultivation methods, as well as chemical control of existing weeds, will keep your lawn weed free in the future.
Take a sample of your lawn soil, and send the dirt in a plastic container to your local university extension for testing. The university will tell you what kind of fertilizer needs to be applied to the lawn, and in what amount, to establish a good turf. The EPA recommends using a complete fertilizer, 10-10-10 or 12-12-12, at one pound per 1,000 square feet if a soil test is not possible.
Use seed when establishing a lawn that contains only a small amount of weed seed. The EPA suggests using grass seed that has 0.05 percent weed seed and 0.15 percent crop seed or less.
Mow your lawn regularly so that the grass blades are between two and a half to three inches in length. The EPA recommends only cutting one third of the leaf at a time with a sharp mowing blade to keep from hurting the grass.
Apply a pre-emergent herbicide to the grass to prevent weed seeds from germinating in the lawn. The University of Minnesota Extension recommends applying it two to three weeks before the weed seed germinates in the spring.
Spray existing weeds with a post-emergent pesticide in liquid form. The University of Missouri Extension recommends spraying the pesticide when winds are low, and during the weeds' highest growing period in the summer.
Dig up perennial weeds using a sharp spade, making sure to remove as much of the root as possible.