The answer to 'mulch thin grass' is that mulching can help thicken up thin or sparse grass, but it needs to be done properly. Mulching involves applying a layer of organic material like wood chips or shredded leaves on top of the lawn. This helps retain moisture, suppress weeds, and gradually break down to feed the soil and grass. However, applying too much mulch can actually smother the grass and prevent it from getting the sunlight and airflow it needs.
The ideal depth for mulch on a lawn is 1-2 inches. Any more than that and you risk suffocating the grass. If your grass is already thin, you'll want to be extra careful not to overdo the mulch. Start with a light, even layer and monitor how the grass responds. If it's still struggling, you may need to remove some of the excess mulch. In some cases, core aeration or overseeding may also be needed to help thicken up the lawn.