Updated at: 19-08-2022 - By: Helen Skeates

How likely is it that you’ll find mold growing in your yard? What do you know about mold in the yard?

When you’ve spent hours cultivating a lush, green yard, you wake up to find areas of strange color spreading. There’s a good chance your lawn is infected with a fungus, but you can still save it yourself.

If you’re reading this right now, there’s a good chance mold growths in your yard. Continue reading if you’re still unsure how to recognize and treat mold.

Is Your Yard Growing Mold?

As moisture is more difficult to control in the outdoors, mold thrives. High humidity, moderate temperatures, and rainy season are ideal circumstances for mold to develop.

What Is Snow Mold & How to Remove It - This Old House

If so, have you noticed any patches of grass with black mold on them? Could it be that some of the blades are becoming brown or yellow?

What about the white patches or the gray areas? You may have fungal diseases or molds in your grass if this is the case.

To learn how to recognize a fungus in your grass, read this in-depth article. This article compiled a list of common lawn illnesses caused by fungi.

You need to know how to detect this to begin dealing with the molds that are growing in your yard.

Symptoms and causes of mold growth might differ from yard to yard. In order to avoid further injury, it is important to thoroughly investigate the issue of unfair treatment of grass.

Getting Rid Of Mold In The Yard

With a variety of molds, a variety of measures had to be performed as well. For more information, see the following:

Brown patches

Large areas of dried grass emerge as a result of the fungus Rhizoctonia.

Fertilize and water the lawn carefully to avoid this problem. Fludioxonil-based fungicides are the best option if the fungus is already present.

Ask a professional for help if you need to utilize chemicals.

Pink snow mold

During late winter, a thick covering of snow traps moisture beneath, causing pink snow mold to form. This causes grass to die from the crown to the roots. Circular spots of mold with a tinge of white to pink color become visible when the snow melts.

To avoid mold growth, don’t leave the lawn snow-covered for long periods of time. Reducing the amount of thatch in the room will help to improve airflow.

Nitrogen is a favorite of pink snow molds, so it’s better to avoid using fertilizer with a high nitrogen content.

Gray snow mold

Irregular areas of white to gray fluffy fungal growth characterize gray snow mold. This illness thrives in a warm, unfrozen environment where there is a large accumulation of snow.

To avoid this mold, it’s essential to keep your lawn trimmed periodically and avoid using too much nitrogen fertilizer in the fall and winter. It’s best to remove as much as possible by raking and mowing the lawn, and then letting it dry properly.

If you’re interested in learning more, check out this guide on how to get rid of snow mold.

Red thread

For those who are patient enough, you can discern a reddish thread structure on the grass with a magnifying glass.

Fertilizing in the late spring and early summer will help get rid of this.. If the condition persists, a fungicide treatment is the best option.

Powdery mildew

An entire stalk can be infected with powdery mildew, which appears as light grey or fine white dots. It thrives in conditions of high humidity and moderate temperatures.

Sulfur-containing organic fungicides can be used to treat and prevent this problem.

Dollar spot

Hollow spots of straw-colored grass resemble Dollar Spot. It can quickly spread if left untreated.

Propiconazole and Fludioxonil are the best fungicides for this.

Slime mold

This mold often appears as an orange or yellow haze and mimics foam in its appearance. Although it is unattractive, it poses no threat to the environment.

You don’t have to get rid of the slime mold right away, but if you want to, you can rake it up and let it dry. Learn how to get rid of slime mold on mulch by reading this article.

Mold Prevention For Your Lawn

It is more difficult to control the moisture and humidity outside than it is to prevent mold from forming. Mold growth can be prevented, but this doesn’t mean that there are no alternative options.

In order to reduce the chance of growth in your yard, consider the following suggestions:

  1. Late-night watering should be avoided at all costs. In order to prevent the growth of fungi, it is best to water in the morning.
  2. If it has rained, there is no need to water your lawn excessively. If you’re wondering when to water your grass, go no further than this article.
  3. Don’t over- or under-fertilize your lawn.
  4. Monitoring thatch in your yard or lawn is a good idea since too much thatch can impede the flow of air and prevent water and fertilizer from getting to the plant roots.
  5. Avoid cutting the grass too short, as this encourages more illnesses to thrive.
  6. It’s also a good idea to conduct soil testing. Make sure the nutrients in the soil are evenly distributed.
  7. Fungicides can be used as a prophylactic measure.

How to Get Rid of Black Mold on Grass

Black mold on your lawn can be a nuisance, and it can arise out of nowhere, producing patches of black stains on your lawn. Fungal activity can lead to the formation of black mold on your lawn, and in most circumstances, pesticides aren’t the best treatment.

The bad news is that black mold on your lawn is difficult to treat, but the good news is that it can be. There are a few simple techniques to treating your lawn that won’t cost you a fortune in chemical purchases. Some varieties of slime mold are beneficial because they devour dead organic waste, but there are many others that are harmful. Slime mold can not actually harm your lawn; rather, it can alter its appearance.

Lawn Slime Mold

Warm, damp conditions are ideal for the growth of black mold on your lawn. Slime mold spores might be pink, blue, red cream, or orange, depending on the color of the slime mold. It is during this time that their hue will darken. The wind is usually to blame for the slime molds being deposited on the grass.

When there is enough moisture, the slime spores proliferate and bloom, resulting in six-inch-wide patches. It is possible to get rid of the black patches on your lawn if you find them unappealing.

Mowing the Black Mold

By mowing your lawn, you can greatly reduce the incidence of black mold. To reduce the impact of black mold on your grass, use a lawnmower. When it’s hot outside, raise your mower’s blades to four inches; when it’s cooler, lower them to around two-and-a-half inches.

After mowing through all of the black mold-infested areas, be sure to discard all of the clippings. Because the black mold won’t recur, you don’t need to worry about finding chemicals to treat the otherwise innocuous ailment. Use the grass clippings instead of the black mold as a mulch instead.

Rinse the Black Mold

Rinsing the grass is another simple and inexpensive way to remove black mold. Simply rinsing the lawn with simple water will eradicate any and all black patches. To apply the black mold to the grass, simply turn your nozzle up to its strongest setting and spray straight on the mold. There is no need to worry about mold spores returning after the water is drenched in them.

Using a garden hose to wipe away the black mold on your lawn is an efficient strategy in dry weather. Once the spores have been rinsed away, they are not likely to hold up. Once the spores have been removed from the grass, they will very certainly die.

Winter Lawn Care: Snow Mold Disease

Remove the Black Mold With a Rake

In both dry and rainy conditions, a lawn rake can be used to remove black mold from your lawn. Mold can be removed by raking the damaged areas gently so as not to harm the grass. A basic bleach and water solution should be used to clean your rake after you’ve gotten rid of the black mold on your grass.

Raking your grass just requires a small amount of force, so the process is quick and easy. The black mold will fall to the ground as a result. Rake your lawn while it’s dry to avoid the black mold sticking to the leaves for best results.

If you don’t have time to remove the mold from your grass, you can simply leave it there. When the weather gets dry, it’ll just fall apart. Most of the time, the black mold flourishes in moist settings, although it will eventually dry out in hot weather as well. When the mold is removed, it is unlikely that it will reappear.

What is Snow Mold?

Lawn diseases such as snow mold are spread by a fungus that mimics snow and feeds on grass when it melts. You might notice the mold itself, or straw-colored blotches on the grass, depending on how warm it has been this winter. All year round, the spores of the fungus can be found in the soil, however they are dormant during periods of excessive heat. When the temperature reaches 32 to 45 degrees Fahrenheit and the snow melts, the spores begin to sprout and spread throughout the soil.

Making Sense of Snow Mold

Freeze-tolerant fungi can develop on any species of lawn grass in locations with cold, wet, and snowy winters, resulting in pink snow mold (Microdochium nivale) and gray snow mold (Typhula incarnata). Snow mold-causing fungi can be found in almost any soil, but the damage they inflict is slightly different in both cases.

  • There are often dead areas of snow mold with a pale gray or white “bleached” appearance under enormous snow drifts, which can be classified as gray snow mold. Soggy grass and moldy mold are a result of snow drifts melting more slowly than the surrounding snow. Patches of gray snow mold can range in size from a few inches to several feet across. It is possible for gray snow mold to damage the grass’s roots if the soil remains moist for long periods of time, but in most circumstances, only the surface blades of the grass are affected.
  • As a result of pink snow mold, circular dead patches with pinkish or rust-colored borders are formed. In a long, rainy spring or a particularly wet fall, pink snow mold can begin to form if the grass is chilly and wet (about 40 degrees Fahrenheit or lower). Pink snow mold can flourish all winter under a coating of snow, causing broad damage to the grass if it starts growing in the fall. This pink snow mold can generate spots of less than 12 inches in diameter, yet they can appear in large numbers throughout the lawn. Patches of pink snow mold-infected grass will not grow back.

Tracking Snow Mold Triggers

Snow mold is a problem for all lawns in cold climates, however some things might enhance the risk:

  • Because the ground is still relatively warm when an early snow falls, it melts fast. As a result, the soil retains moisture, resulting in wet and cold grass and the growth of snow mold.
  • As they disintegrate, dried-out leaves on the ground produce a moist organic blanket. As a result, snow mold fungus can flourish.
  • Soil fungi can thrive in a moist environment where grass grows long in the fall, like a blanket of organic materials on top of the soil.
  • Snow mold thrives in sections of the lawn that are saturated with water. It is essential for snow mold to thrive in a constant state of moisture.
  • When you shovel your driveway and walkways, you may produce snow drifts or big mounds that can harbor mold spores. In the spring, when the snow melts more slowly, the soil beneath becomes saturated, creating the ideal conditions for the growth of snow mold.
  • However, if administered six weeks before a big snow or frost, fertilizer may keep lawn grass green when it should be dormant. The blades of green grass become soft and mushy when they are covered in snow or ice, increasing the risk of mold.
  • As the grass grows older, it develops a thick covering of thatch, which can harbor the fungus responsible for snow mold. Thatch prevents soil from drying out while also providing an abundance of organic matter for the growth of snow mold in the winter months. Thatch.

Restoring a Lawn Afflicted with Snow Mold

Once the soil dries up and the temperature rises above 55 degrees Fahrenheit, snow mold fungi stop developing. Remove any dead grass from the patches and reseed them with fresh grass seed at this point in time. There will be no fresh damage until the following winter or spring, thus a lawn fungicide should not be applied at this time. Preventive maintenance is more important than damage repair when it comes to keeping your grass healthy and mold-free.

Stopping Snow Mold Before It Starts

It is the greatest approach to keep your lawn green and healthy to avoid snow mold from forming. In order to keep the fungi at bay, follow the instructions listed below.

  • To allow your lawn to lie dormant, don’t fertilize within six weeks of the first forecast snowfall in your location. Snow mold can’t thrive on dry and parched grass blades throughout the winter months.
  • In the fall, when the grass goes yellow and stops growing, cut the lawn to a height of 112 inches.
  • Before they decay on the grass, rake up dried leaves.
  • A thatch rake, such as the Ames 15-inch Adjustable Thatch Rake, can be used to remove thatch from lawns (available from Amazon). Raking your grass twice a year, in the summer and the fall, is the greatest way to keep thatch under control.
  • Topsoil can be used to fill in low spots in your yard to assist water to flow away rather than sit there.
  • The best time to apply a preventative grass fungicide, such as Scotts DiseaseEx Lawn Fungicide (available from Amazon), is in late fall, just before the first heavy snowfall arrives. Freeze-tolerant snow mold is kept at bay by this.

What Types of Snow Mold Are There?

Several circular bald spots on lawns are caused by one of two forms of this fungus.

  • Colorful pink snow mold (sometimes referred to as the Fusarium patch) is a whitish pink.
  • Typhula blight, commonly known as gray snow mold, is a white to grayish-white color.

Allergy sufferers may be affected by both types of mold, which cause the grass to die. The more serious of the two molds, pink snow mold, can damage grass roots as well as blades, making it more dangerous than white snow mold. Even at temperatures as low as 60 degrees Fahrenheit, it can continue to grow and spread. After a gray snow mold infestation, your grass may re-grow, but not after a pink one.

What Kinds of Grass Does Snow Mold Affect?

Any variety of cool-season turfgrass that has been snow-covered for an extended period of time might develop snow mold. However, the Integrated Pest Management Department at the University of Illinois says that some grasses, such bentgrass, are more vulnerable to this fungus. The most popular cool-season grass, Kentucky bluegrass, is moderately damaged by snow mold, while fine fescue is more resistant than other varieties.

Top 3 Reasons Moss Grows in a Lawn | TurfGator

How Do I Remove Snow Mold From My Lawn?

The bad news is that it’s too late once you notice snow mold. At this time, applying fungicide—special chemicals that kill mold—is useless. In order to speed up the drying process, all you can do is gently rake over the area to dislodge the snow mold grass and help the soil to dry up faster.

By waiting until the weather warms up, you’ll have a better notion of how much grass has been damaged. As a reminder, the roots of your lawn may recover from gray snow mold. Rake out dead grass and reseed bare sections if your lawn has been infected with pink snow mold.

How Do I Prevent Snow Mold From Growing?

Preventing the growth of snow mold is, as you might expect, the most important step in the removal process. In order to get your lawn ready for winter, there are a few things you should and shouldn’t do in the fall.

  • Please mow before it gets too cold. Reduce the amount of moisture held in the grass and soil by cutting the lawn a little shorter than usual. Garbage bagging your lawn clippings will help to keep the soil dry.
  • Apply a fungicide as a prophylactic measure. If you know your grass is vulnerable to snow mold, apply a specific treatment before the heavy snowfall begins.
  • DETHATCH YOUR LAWN AT LEAST TWICE A YEAR! In order to prevent excessive thatch buildup, use grasses with lower thatch production rates.
  • Don’t forget to check that your lawn has adequate drainage. Fill up any low spots with topsoil to prevent the formation of snow mold.
  • NEVER fertilize after the first frost has passed. It is easier for mold to grow on dry, dehydrated cool-season grasses throughout the winter months. During the spring, they will come back to life on their own. Fertilizing should not be done within six weeks of the first anticipated snowfall to avoid interrupting this process.
  • DON’T allow snow or leaves to accumulate. Raking up leaf piles at the end of the season will help prevent moisture buildup, which is harmful for grass. Make sure you don’t build up a ton of snow in your driveway or on your walkway when you’re shoveling.

Restoring Your Lawn

Don’t be alarmed if you see snow mold in the spring; it’s usually gone by the time temperatures warm up. When the temperature drops below 45 degrees and the earth begins to dry out, the snow mold fungus will stop developing.

As a stopgap measure, you might rake over wet portions of your lawn to speed up the drying process. To fix the bare places, sod them with fresh grass seed. Don’t use fertilizers or fungicides at this moment, since they won’t assist and will actually harm your grass as it tries to repair itself.

The experts at TruGreen can help you prevent snow mold, or if you’re having difficulties getting your grass back into shape after a big snow mold outbreak. Your lawn will always look its best, no matter what the weather is like. Get started by calling 1-866-817-2287 or filling out this quick form.


How do I get rid of mold in my yard?

The vast majority of the time, vinegar will kill algae and around 90% of the time, kill mold. Scrub the moldy areas of the lawn with a vinegar-soaked scrub brush. Using a spray bottle of vinegar can be used for minor areas, but if you’re dealing with a huge area of mold, you’ll need a bucket.

What causes mold to grow in yard?

Following a period of time when snow accumulates on the grass, and as the snow melts it mixes with other organic debris such as dead grass or twigs to form snow mold. In other words, any low, sinking sections of a lawn where water can collect are great targets for this perfect storm of nature.

Can outdoor mold make you sick?

If you have allergies or asthma, mold in your house may make you unwell. Allergy to molds isn’t necessary to experience the negative health effects of mold exposure.

What is the black stuff growing in my yard?

There may be a gardener who wonders, “What is this dark substance on my lawn?” It’s slime mold, and there are a lot of different kinds. The mysterious black stuff that coats lawns is actually a primitive organism that serves a purpose. Venomous and slimy, it feeds on decaying organic materials and germs on leaves.

What causes black mold on grass?

Sooty mold thrives on honeydew from aphids, Slime mold, brown patch disease, and gray leaf spot can all cause black fungus on the grass. As it creeps up the stem, slime mold acquires a powdery black appearance.

Can mold grow in your lungs?

Mold can also form a ball in your lungs, but this is less common. Aspergillus mold can cause this disorder, which is known as aspergilloma. Most of the time, the ball will stay in your lungs, although it might cause tissue damage. Shortness of breath, coughing up blood, and other symptoms are typical.


With a variety of molds, you’ll need a lot of research to figure out the best way to get rid of it. The best technique to get rid of mould is to begin with this method.

Some mold has no effect on the environment, while a large number of others do. The greatest way to keep your yard healthy is to get rid of these molds.