Mushrooms In New Sod: Why And What to Do?

Mushrooms are a common sight in lawns, but many homeowners are unsure of how to manage them. While most mushrooms are harmless, they can be unsightly and indicate underlying issues with the lawn. In this article, we will explore the science behind mushrooms, the causes of their appearance in new sod, and prevention and control methods.

The science behind mushrooms

A. Fungi and their role in the ecosystem

Fungi are an essential component of the ecosystem, breaking down organic matter and recycling nutrients. They form symbiotic relationships with plants, helping them to absorb nutrients and ward off diseases. Mushrooms are the reproductive structures of fungi, releasing spores into the air to propagate.

B. Types of mushrooms commonly found in lawns

The most common types of mushrooms found in lawns include the fairy ring, puffball, and stinkhorn. Fairy rings appear as a circular pattern of mushrooms, while puffballs look like white or brown balls on the ground. Stinkhorns have a distinctive, foul odor and are shaped like a phallus.

Causes of mushrooms in new sod

A. Excess moisture

Mushrooms thrive in moist environments, so excess moisture in the soil can lead to their growth. This can be caused by overwatering, poor drainage, or heavy rainfall.

B. Decomposing organic matter

Mushrooms feed on decomposing organic matter, so any buildup of thatch or tree roots/stumps can provide a food source for them.

1. Thatch buildup

Thatch is a layer of dead grass and other organic matter that accumulates on the surface of the soil. When it becomes too thick, it can prevent water from reaching the roots, leading to excess moisture and mushroom growth.

2. Tree roots and stumps

When a tree is removed, the roots and stump can take years to decompose. During this time, they can provide a food source for mushrooms.

C. Soil compaction

Compacted soil can prevent water from draining properly, creating a moist environment that mushrooms thrive in.

D. Poor drainage

Poor drainage can lead to excess moisture in the soil, promoting mushroom growth.

E. Shade and lack of sunlight

Mushrooms prefer cool, shady environments, so areas of the lawn that receive little sunlight can be a breeding ground for them.

Prevention and control methods

A. Proper sod installation

1. Soil preparation

Before laying sod, make sure the soil is properly graded and free of debris. This will promote proper drainage and prevent thatch buildup.

2. Sod selection and quality

Choose high-quality sod that is free of disease and pests. This will reduce the likelihood of mushrooms growing in the lawn.

B. Lawn maintenance

1. Watering guidelines

Follow watering guidelines for your specific type of grass to prevent excess moisture in the soil.

2. Mowing and aeration

Regular mowing and aeration can prevent thatch buildup and promote healthy root growth.

3. Fertilization

Proper fertilization can improve soil health and promote healthy grass growth, reducing the likelihood of mushrooms.

4. Dethatching

If thatch buildup is a problem, consider dethatching to remove the layer of dead grass and organic matter.

C. Environmental adjustments

1. Improving drainage

If poor drainage is an issue, consider installing a drainage system or adding soil amendments to improve soil structure.

2. Addressing shade issues

If mushrooms are growing in shaded areas, consider trimming back trees or adding more sunlight to the area.

D. Chemical control options

1. Fungicides

Fungicides can be used to control mushroom growth, but should be used sparingly and according to instructions.

2. Safety considerations

When using chemical control options, be sure to follow all safety precautions and keep children and pets away from the treated area.

When to seek professional help

A. Persistent mushroom infestations

If mushrooms continue to be a problem despite preventative measures, it may be time to seek professional help.

B. Identifying potential hazards

If mushrooms are growing near power lines, gas lines, or other hazards, a professional should be consulted to ensure safety.

C. Expertise in lawn care and maintenance

A professional lawn care company can provide expertise in lawn care and maintenance, reducing the likelihood of mushroom growth and promoting healthy grass growth.


While mushrooms in lawns can be unsightly, they are typically harmless and can be controlled with proper lawn care and maintenance. By understanding the science behind mushrooms and addressing underlying issues, homeowners can enjoy a healthy, beautiful lawn free of unsightly fungi.


  • Nathan Collins

    Having spent years working in the landscaping industry, Nathan Collins has cultivated a wealth of knowledge about the natural world. He is committed to helping others appreciate the beauty in their backyards, whether it's through identifying rare rocks and minerals or crafting the perfect landscape.

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