To prevent weed seeds that were sown last fall from germinating, consider using a combination product this spring that contains fertilizer with a pre-emergent herbicide to prevent weed seeds from germinating.

Do not use a pre-emergent if you plan on over-seeding or patching your lawn because the grass seed, like the weed seed, will not germinate in the presence of a pre-emergent treatment.  Remember that correct mowing heights and a healthy lawn, will also make it difficult for weed seeds to reach the ground and germinate.

For seeds that have already germinated, or for perennial weeds, you will need to use a lawn product with a post emergent herbicide for weed control which works on weeds while they are still small, while also fertilizing the lawn.