Help! My End-of-Summer Lawn is Overrun with Weeds!

Your lawn seemed like the perfect outdoor space for play and relaxation, but as summer reaches its peak, you may find it overrun with weeds. So, what went wrong?

Weed outbreaks in late summer are common and can be a sign of underlying issues with your soil. Lawns that haven’t been properly maintained or have poor soil health are particularly vulnerable to a surge of weeds as the season progresses. We’ve seen this problem many times and have developed a step-by-step process to help restore lawns and prevent future weed invasions.

Whether your lawn is suddenly sprouting all kinds of weeds or crabgrass is taking over, we’re here to guide you through the next steps.

Why Are Weeds Suddenly Taking Over My Lawn?

If your lawn is being overrun by weeds as summer draws to a close, you might be mowing your grass too short. Lawns with shorter blades are more prone to weed infestations, especially during the hot summer months. Weeds thrive in late summer, taking advantage of the extreme temperatures and compacted soil to establish shallow roots. Common offenders include invasive ground ivy, crabgrass, white clover, nutsedge, and spurge.

The key to preventing a lawn full of weeds lies in maintaining healthy soil and preventing compaction. Soil compaction, often caused by infrequent aeration and heavy foot traffic, prevents grass from developing deep roots necessary for nutrient absorption and disease resistance. This creates an opportunity for weeds to take root and compete with your grass for vital resources.

Other factors that can hinder your lawn’s ability to establish strong roots include improper watering patterns and fluctuating temperatures. Overwatering can lead to fungal diseases that disrupt nutrient absorption, while imbalances in soil pH and nutrient levels can further contribute to weed growth. If your lawn is struggling, consider a soil test to determine what nutrients might be missing and incorporate regular fertilization and soil conditioning into your lawn care routine.

What Should I Do Next?

At this stage of the season, with a lawn full of weeds, your best bet is to plan for next year. The good news is that the upcoming fall is the ideal time to reseed your lawn and prepare it for the spring.

The best way to reduce weed infestations is to maintain a thick, healthy lawn with well-aerated soil. Aeration is essential for loosening compacted soil, increasing nutrient absorption, and promoting deeper root growth. If your lawn is heavily compacted or has not been aerated in over a year, aeration is crucial.

To prepare your lawn for aeration, start by cutting the grass short. While this won’t eliminate the weeds, it will improve seed-to-soil contact, maximizing seed germination. Next, power rake to remove debris, then aerate the lawn deeply, especially if the soil is compacted.

Is Aeration Enough?

Aeration alone can significantly strengthen your lawn, but for the best results, combine it with other lawn care practices. After aerating, overseed your lawn to give it a competitive edge for the next growing season. The optimal time to overseed is in the fall when soil temperatures are above 50 degrees. Choose grass seeds suited to your local climate and lawn conditions. Turf Type Tall Fescue is ideal for lawns with a mix of sun and shade, while Fine Fescue is better for shaded areas. Aim for about 6 to 8 pounds of seed per 1,000 square feet of lawn.

Lightly rake the lawn to distribute the seed evenly, then water regularly—2-3 times a day for 5-15 minutes—for the next 3-4 weeks. Consistent watering is key to proper germination.

How Can I Lock In Nutrients and Prevent Spring Weeds?

Now that your lawn is aerated and overseeded, lock in nutrients with a good soil conditioner and an organic, nutrient-rich top dressing. Applying compost or fertilizer 2-3 weeks after reseeding will protect the new grass during dormancy and cold temperatures. Wait another 2-3 weeks before the next mowing, leaving the grass slightly longer to protect the new blades and retain soil nutrients.

Come spring, your lawn will be well-prepared for a healthy, vibrant growing season. Adhering to a proper watering and fertilizing schedule will help prevent weeds and ensure your lawn thrives.

When Is the Best Time to Aerate, Reseed, and Fertilize My Lawn?

We recommend aeration and overseeding in September-October, depending on your local weather conditions and soil type. Following a fall lawn care schedule will give your lawn the best chance to thrive in the spring and help prevent weed outbreaks next summer.

If maintaining a seasonal lawn care routine is challenging, we’re here to help!