How do you get rid of that fast growing lime green grass looking stuff?

The fast-growing lime green grass-looking stuff is likely moss, which can indeed spread rapidly and dominate your lawn if left unchecked. Getting rid of moss requires a multi-pronged approach that includes:

1. Determine the Moss Species:

It's essential to identify the specific type of moss in your lawn, as different species may respond differently to treatment methods. Identify whether you're dealing with lawn moss (Bryum spp.) or another moss variety.

2. Environmental Factors:

Address any underlying environmental factors that may be contributing to moss growth. Moss thrives in acidic, damp, and shady areas. Aerate the soil to improve drainage, increase sunlight by trimming overhanging trees or removing obstacles, and apply lime to raise soil pH levels if needed.

3. Dethatching:

Remove the layer of dead grass and organic matter that accumulates on the soil surface, known as thatch. Dethatching allows air, water, and nutrients to reach the grass roots and reduces the favorable environment for moss growth.

4. Iron Treatment:

Apply an iron-based moss killer or moss control product as per the manufacturer's instructions. Iron sulfate or ferrous sulfate are commonly used for this purpose and are effective in controlling moss. However, be cautious as iron can also discolor the grass, hardscaping, and other surrounding surfaces.

5. Raking:

After a few days of iron treatment, vigorously rake the lawn to loosen and remove the dead moss. It's crucial to dispose of the moss appropriately, as leaving it on the lawn can contribute to new moss growth.

6. Overseeding:

Once the moss is removed, consider overseeding your lawn with a high-quality grass seed mix. This helps fill in bare spots, prevents new moss from taking hold, and thickens the lawn. Choose grass varieties that are shade-tolerant and suited for your climate.

7. Mowing Practices:

Adopt proper mowing practices. Avoid cutting the grass too short, as longer grass (around 2.5 to 3 inches) shades the soil, reducing the moss-friendly environment. Mow regularly and leave grass clippings on the lawn as a natural fertilizer.

8. pH Level Adjustment:

Monitor your soil's pH level and make adjustments if necessary. Moss prefers acidic soil, so maintaining a slightly acidic to neutral pH level between 6.0 to 7.0 can discourage moss growth.

9. Ongoing Maintenance:

Regular maintenance is key to preventing future moss growth. Keep your lawn healthy and vigorous by following proper watering, fertilizing, and weed control practices.

Remember that patience is necessary when dealing with moss. It can take several weeks to months to see significant results. With consistent effort and proper care, you can effectively control moss growth and maintain a healthy, vibrant lawn.