As winter snow blankets lawns, many homeowners may not think about their grass until spring. But lurking beneath the snow, there’s a common lawn issue that could surprise you: snow mold. Understanding what this common lawn disease is and how to prevent it can save you from a patchy, unhealthy lawn when warmer weather arrives.
What Is Snow Mold?
It is a fungal disease that develops on grass under snow cover. There are two main types:
- Gray Snow Mold (Typhula blight): Appears in circular, straw-colored patches with a grayish hue. It’s less aggressive but still damaging.
- Pink Snow Mold (Microdochium patch): Causes pinkish or salmon-colored patches and can damage both grass blades and roots, making it more severe.
It also thrives in cool, damp conditions, particularly when snow sits on unfrozen ground for long periods. It can appear in early spring as the snow melts, leaving unsightly patches of damaged grass.
Signs to Keep an Eye Out for:
- Circular, matted patches of grass, often with a gray or pink tint.
- Grass that feels slimy or wet to the touch.
- Dead or discolored areas that don’t bounce back as the lawn dries out.
How to Prevent it:
Taking proactive steps in late fall and winter can significantly reduce the risk of snow mold. Here are some tips:
1. Mow Properly Before Winter
Cut your grass to the appropriate height before the first snowfall. A final mow of around 2 to 2.5 inches helps reduce excess moisture and matting without stressing the grass.
2. Remove Lawn Debris
Clear leaves, sticks, and other debris from your lawn in the fall. Debris traps moisture and provides a perfect environment for fungal growth.
3. Avoid Excessive Thatch
Thatch is a layer of dead grass and roots that builds up on the soil’s surface. Raking your lawn in the fall helps break up thatch and improve air circulation.
If you’re shoveling snow, try not to pile it in one spot on your lawn. Thick snow piles take longer to melt, increasing the likelihood of snow mold.
What to Do If You Spot Snow Mold
If snow mold appears despite your efforts, don’t worry—your lawn can recover with the right care:
- Rake Lightly: Gently rake the affected areas to break up matted grass and improve airflow. Be careful not to tear up healthy grass.
- Dry Out the Lawn: Allow the grass to dry naturally. it thrives in moisture, so drying out the area helps halt fungal growth.
- Fertilize Strategically: Apply a balanced fertilizer to encourage new growth, but avoid over-fertilizing, as this can worsen the problem.
- Overseed Bare Spots: If snow mold causes significant damage, overseed the affected areas to fill in bare patches and restore a lush lawn.
Protect Your Lawn Year-Round
Snow mold prevention is just one part of maintaining a healthy lawn. By practicing good lawn care habits and addressing problems early, you’ll set your lawn up for success in every season.
