Understanding Snow Mold: Protecting Your Ohio Lawn from This Common Winter Disease

As winter gives way to spring in Ohio, many homeowners may notice unsightly patches of discolored, matted grass on their lawns. These areas are often the result of snow mold, a common fungal disease that develops under a blanket of snow. While there are two primary types of snow mold—pink (Microdochium nivale) and gray (Typhula spp.)—homeowners in Ohio are seeing an increase in pink snow mold this season. Understanding the causes, prevention, and treatment of snow mold can help protect your lawn and ensure a healthy recovery as temperatures rise.

What is Snow Mold?

Snow mold is a fungal disease that thrives in cold, wet conditions, typically appearing in early spring as the snow melts. The disease manifests as circular patches of matted grass, ranging in color from grayish-white to pink. While gray snow mold primarily affects the grass blades, pink snow mold is more aggressive and can damage the crown and roots, making it more difficult for the lawn to recover.

Pink vs. Gray Snow Mold

• Pink Snow Mold (Microdochium nivale): This type of snow mold is more damaging as it can infect both grass blades and roots. It appears in pinkish or reddish patches and tends to persist even after the snow melts.
• Gray Snow Mold (Typhula spp.): While still unsightly, gray snow mold is less harmful than pink snow mold. It appears as grayish-white patches and primarily affects the leaf tissue, with grass recovering more easily as temperatures warm.

How to Prevent Snow Mold

Preventing snow mold starts in the fall with proper lawn care practices:

• Mow the Lawn Short Before Winter: Keeping grass at a lower height before winter reduces the chances of excessive moisture buildup under the snow.
• Remove Leaves and Debris: A thick layer of leaves or other organic material can trap moisture and encourage fungal growth.
• Time Your Fall Fertilization: Apply a balanced fertilizer in the fall when the grass is still actively growing but preparing for dormancy. This helps the lawn strengthen its root system and resist disease, including snow mold. Avoid applying high-nitrogen fertilizers late in the season, as this can encourage excessive growth that is more susceptible to snow mold.
• Improve Drainage and Aeration: Aerating your lawn in the fall helps improve drainage and reduces the likelihood of moisture retention, which creates a favorable environment for snow mold.

Snow Mold and Lawn Recovery

Once snow mold has developed, the extent of the damage will determine the best course of action. While some lawns bounce back naturally as temperatures rise, others may need a helping hand. The good news is that early intervention can speed up recovery and prevent lasting damage. In many cases, simply improving airflow, ensuring proper lawn hydration, and maintaining healthy mowing habits will allow the lawn to regain its lush, green appearance.

If certain areas struggle to recover, homeowners might consider light overseeding in the spring to encourage new growth. For persistent issues, working with a lawn care professional can help determine if additional treatments, such as soil amendments or targeted fungicide applications, are necessary to protect the lawn long-term.

Professional Help for Snow Mold Prevention and Treatment

If you're looking to protect your lawn from snow mold or need assistance with recovery, consider contacting Grunder Green. We can provide tailored solutions to prevent and treat snow mold, ensuring your grass stays healthy and resilient throughout the seasons. Contact our team today!