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Turf Disease in Minnesota: How to Prevent Lawn Fungus Naturally

Posted on | by Organic Lawns by Lunseth

Minnesotans love their thick green lawns, but warm temperatures, humidity, and frequent rain also create the perfect conditions for turf diseases. If you’ve noticed brown patches, pink threads, or circular dead spots in your lawn, a fungal disease may be the culprit.

The good news? Healthy, organically managed lawns are better equipped to resist disease. At Organic Lawns by LUNSETH, we believe the best defense against lawn disease is building healthy soil and strong turf rather than relying on routine fungicide applications.

What Causes Turf Disease?

Most lawn diseases are caused by naturally occurring fungi that become active when environmental conditions are favorable. Disease develops when four factors come together:

  • A susceptible grass plant
  • A disease-causing fungus
  • Favorable weather conditions
  • Enough time for the fungus to spread

Minnesota’s cool-season grasses—including Kentucky bluegrass, perennial ryegrass, and fine fescues—can be vulnerable during periods of prolonged moisture, high humidity, poor air circulation, or heat stress. The University of Minnesota Extension notes that proper cultural practices are the most effective way to reduce disease pressure.

Common Lawn Diseases in Minnesota

Several turf diseases are common throughout the Twin Cities and greater Minnesota.

Red Thread

Red thread is one of the most common lawn diseases in Minnesota, especially during cool, wet weather. It appears as pink or reddish threads extending from grass blades and often affects lawns that are low in nitrogen.

Fortunately, red thread rarely kills the grass. Improving overall lawn health is usually enough for the turf to recover.

Dollar Spot

Dollar spot creates small, straw-colored patches about the size of a silver dollar. It often develops in lawns that are stressed by drought or lack adequate nutrients.

Snow Mold

After a long Minnesota winter, gray or pink patches may appear as the snow melts. This is typically snow mold. While it can look alarming, most lawns recover with light raking, improved airflow, and warmer weather. Spring fungicide applications are generally unnecessary.

Rust

Rust is a yellow/orange/red powder on leaf tissue that will discolor shoes. It’s most severe in late summer to early fall when grass isn’t actively growing. Rust likes warm nights, wet leaves and low light intensity areas of the lawn. The best cultural control is to minimize leaf wetness, prevent drought, and use tolerant grass cultivars

Ascochyta

It you see individual leaves die back at leaf tip you may have Ascochyta. You can also see tiny brown and black fungal structures on the dead leaf tissue.  This disease thrives in warm and humid conditions, especially in a shift from cool/moist weather. To avoid Ascochyta, minimize leaf wetness, keep grass cut high, and avoid mowing until symptoms subside

How to Prevent Turf Disease Naturally

An organic lawn care program focuses on creating conditions where turfgrass thrives and diseases struggle to spread.

Water Deeply—and Early

Watering in the early morning allows grass blades to dry quickly after sunrise. Watering in the evening leaves moisture on the grass overnight, giving fungi more time to grow.

Established Minnesota lawns generally need about one inch of water per week, including rainfall, during active growth.

Mow High

Keeping your mower at about 3 to 4 inches encourages deeper roots, shades the soil, and reduces stress during summer heat.

Also remember to keep mower blades sharp. Clean cuts heal more quickly and are less susceptible to disease.

Feed the Soil

Healthy soil grows healthier grass.

Organic fertilizers release nutrients gradually, promoting steady growth without the flush of tender foliage that can be more susceptible to disease. Building soil biology also helps improve drainage, root development, and overall turf resilience.

Improve Air Circulation

Lawns surrounded by dense trees, shrubs, or structures often stay damp longer.

Pruning nearby vegetation and reducing excessive thatch can improve airflow and help grass dry more quickly after rain or irrigation.

Avoid Overwatering

Too much water is just as harmful as too little.

Waterlogged soil reduces oxygen around roots and creates favorable conditions for fungal pathogens. Water deeply but less frequently rather than applying small amounts every day.

Why Organic Lawn Care Makes a Difference

Healthy lawns naturally tolerate stress better.

Instead of depending on repeated chemical treatments, organic lawn care strengthens the soil ecosystem so grass can better withstand drought, disease, insects, and seasonal weather changes. While no lawn is completely immune to fungal diseases, a dense, vigorous lawn is much less likely to experience severe outbreaks.

This approach aligns with recommendations from the University of Minnesota Extension, which emphasizes proper mowing, watering, fertilization, and timing of lawn maintenance as the foundation of disease prevention.

When Should You Call a Professional?

If your lawn develops expanding brown patches, recurring disease problems, or widespread thinning, it’s worth having an expert evaluate the cause. Not every brown area is a fungal disease—drought stress, insects, compacted soil, or nutrient deficiencies can produce similar symptoms.

At Organic Lawns by LUNSETH, we take a whole-lawn approach. Rather than simply treating symptoms, we evaluate soil health, mowing practices, watering habits, and environmental conditions to develop a long-term plan that helps your lawn stay healthy naturally.

Build a More Disease-Resistant Lawn

Preventing turf disease starts long before symptoms appear. Proper mowing, smart watering, healthy soil, and organic nutrition all work together to create a lawn that’s naturally more resilient throughout Minnesota’s changing seasons.

If you’d like help building a healthier lawn without unnecessary chemicals, Organic Lawns by LUNSETH can create a customized organic lawn care program designed specifically for Minnesota’s climate.Top of FormBottom of Form Contact the experts at Organic Lawns by LUNSETH for an organic treatment program or landscaping design tailored to Minnesota conditions that can help restore balance naturally — without unnecessary chemicals or harsh inputs.

This blog post is based on guidance from the University of Minnesota Extension Service.

Preparing for Winter: Mowing, Raking or Mulching, Dormant Pruning

Posted on | by Organic Lawns by Lunseth

Autumn is here and the trees are shedding their leaves. Your yard is entering a critical period that can affect next spring’s growth. Fall yard maintenance isn’t just about keeping things tidy—it’s about giving your lawn and landscape the care they need to rest and regenerate. From deciding whether to rake or mulch those fallen leaves, to giving your grass one last proper mowing, to knowing when to do some dormant pruning, now’s the moment to develop a plan so your outdoor spaces have a healthy, beautiful comeback when warmer days return. Here are some helpful tips from the University of Minnesota Extension Service.

Rake or Mulch

Mulching leaves into your lawn isn’t just sustainable – it’s an effective practice for healthier turfgrass. Mulch regularly when leaves are dry, and double pass for a finer mulch. This enables them to break down quickly and integrate into the lawn and saves you the labor of picking them up.

While mulched leaves do not return as much nitrogen as grass clippings, this still reduces the need for supplemental fertilizer and is a more eco-friendly and cost-effective practice.

In addition to releasing nutrients, decomposing leaves improve soil structure. The improved soil structure leads to better water infiltration, moisture retention, and root growth. It also improves access to nutrients, water, and air.

Leaf mulching is also very effective as a weed preventative as it covers bare spots and inhibits weed seed germination.

But, there’s a point when excessive leaves left on the surface can damage the lawn in the spring. For example, excessive tree leaf residue can promote snow mold damage.

The extension service recommends mulching tree leaves until you can only see about half of the lawn surface. When less than 50% of the lawn is visible, begin bagging the tree leaves to compost them off-site.

Mowing Grass

Should you mow your lawn shorter going into the winter? Extension says it depends. Some of the benefits of mowing your lawn a little shorter:

  • Makes collecting tree leaf litter easier.
  • Reduces the risk of snow mold diseases.
  • Reduces damage from burrowing rodents like voles.
  • Helps with dormant seeding. 

But they caution not to lower the mowing height too much all at once, and not any lower than 2 inches after mowing. In general, never cut more than one-third of grass height in a single cutting – this might stress the grass plants going into winter.

Wait to Prune!

Fall is not the time to start pruning back your trees and bushes. The best time to prune is in the late winter, just before spring growth starts. This way the fresh wounds are exposed for only a short length of time. Then the new growth begins the wound sealing process.

Pruning at the proper time can avoid certain disease and physiological problems:

Need Help Preparing for Winter?

Let our team help you get your yard ready for the winter, so you have a healthy green lawn in the spring. Contact the experts at Organic Lawns by LUNSETH to take the first step toward a greener, healthier, chemical-free lawn in 2026.

Protecting Your Yard from Deicing Salt

Posted on | by Organic Lawns by Lunseth

Every Minnesotan knows that unsettling feeling.  You step on your sidewalk and immediately realize that the best-case scenario is you can slide across the pavement to reach where you’re going – without falling!  That’s when the bags of salt come out. But, while deicing salt reduces the danger of hurting yourself, unfortunately, it increases the danger of winter damage to your lawn.

LUNSETH agrees with the advice provided by the University of Minnesota Extension Service, regarding ways to deal with icy sidewalks without causing irreparable damage to your grass.  Here are some of their suggestions.

Effects of Deicing Salt

Using deicing salts on paved areas increases the salt content in the soil of adjoining turf and gardens. The salt damages roots and causes dehydration in many grasses, causing discoloration or death.

Ways to Avoid Deicing Salt

Sand is a time-tested solution for increasing traction on icy surfaces. The downside is that it doesn’t melt ice and can be a nuisance when it’s tracked into the house. 

Beet brine and alfalfa meal are more recently suggested deicing alternatives. Sugar beet brine can effectively lower the temperature at which salts can be applied and reduce the environmental impact of salts. Alfalfa meal is an effective deicer and provides traction, but it contains nitrogen which can contaminate waterways as part of your yard’s runoff.

Good Shoveling Practices Reduce the Need for Deicing Salt

If you clear the snow often to remove as much snow as possible, it prevents ice buildup. With less snow on your paved areas, when the winter sun appears, it will do an amazing job of melting off any snow and ice that remains. 

If You Need Deicing Salt

There will probably be times when it’s important to make sure your sidewalks and driveway are ice-free, and deicing salt needs to be used.  When this happens, keeping a few tips from the Extension Service in mind will minimize the potential damage deicing salt will cause.

  • Apply the deicing salts correctly and sparingly to critical areas only.
  • Do not apply deicers to snow. Remove the snow first.
  • More is NOT better. A coffee mug of salt (about 12 oz.) is all that is needed for about 1,000 sq. ft., approximately the area of a 20-ft driveway or 10 sidewalk squares.
  • Spread salt evenly leaving about 3 inches between salt grains. Avoid spilling piles of salt.
  • Sweep up any salt grains you see on dry surfaces to prevent it from washing or blowing into plants and waterways. Save it in a container to reapply later in the season.

Planning Ahead – Healthy Turf and Salt-Tolerance Grasses

Making sure your turf is as healthy as possible will help it fight the effects of deicing salts and other winter damage. One product LUNSETH recommends is C20 Soil Builder to stimulate biological activity 157x more than compost. This promotes root health for all types of plants.

Choosing grasses that are heartier is important as well.

  • The UMN Turf Department research found that Fine fescues perform the best in high-salinity environments. They recommend Creeping Red Fescue because it performs the best, but seed mixes containing any fine fescue species will perform well in high-salinity environments. 
  • Tall fescue has intermediate salt tolerance among turfgrass species.
  • Kentucky Bluegrass performs poorly with high salt concentrations.

If deicing salt damages your grass, contact the experts at Organic Lawns by LUNSETH in the spring. We will come up with a plan to repair the damage and help your entire yard thrive because, naturally, we can help!

Organic Methods for Controlling Crabgrass in Your Lawn

Posted on | by Organic Lawns by Lunseth

Crabgrass is a common warm-season annual that’s a member of the grass family. The problem is that most people don’t think of it as a grass and want it gone! There are two primary species of crabgrass: the large or hairy crabgrass (Digitaria sanguinalis) and small or smooth crabgrass (Digitaria ischaemum). Chances are you have one or both.

Why Does Crabgrass Thrive?

There’s a reason you probably can’t keep up with crabgrass spreading in your yard. It’s one of the most persistent weeds around and a prolific seed spreader. The University of Minnesota Extension Service explains that crabgrass survives harsh conditions through its abundant tillering (creation of shoots other than the main shoot) and seed production. Its structure allows up to 150,000 seeds per plant to be produced in a single season. It’s no wonder it’s hard to keep it under control.

The UMASS Extension Center states that crabgrass seeds germinate best from early spring to late summer. And it continues to grow until midsummer when days become shorter. This is when its growth slows and the plants enter the reproductive stage.

Controlling Crabgrass

Crabgrass is generally controlled with preemergence herbicides that are applied before the seeds germinate. LUNSETH controls crabgrass with an early and heavy application of corn gluten meal, aiming to get it down before the soil temperatures reach 55°F. Unfortunately, we have no organic post-emergent solutions for crabgrass. Synthetic herbicides, such as Quinclorac, can kill it and are best applied during the first tillering stage.

It’s important to remember that controlling crabgrass isn’t a quick fix.  UMASS Extension warns that crabgrass cannot be controlled in one growing season because of the great number of viable seeds that can accumulate in the soil from years of infestation. It takes several years of controlling crabgrass seed production to reduce the viable seed supply.

The good news is that good cultural practices can result in a healthier, denser turf, which in turn increases its overall competitive nature and decreases the severity of crabgrass infestations. Some crabgrass infestations can be significantly reduced with the use of appropriate and well-timed cultural practices.

Conclusion

The experts at Organic Lawns by LUNSETH help our clients control crabgrass organically by emphasizing soil health, proper maintenance practices, and natural remedies. By integrating these methods into your lawn care routine, you can gradually reduce crabgrass while promoting a vibrant and resilient grassy landscape. Embracing organic solutions not only protects the environment but also contributes to a healthier and more sustainable outdoor space for you and your family to enjoy.

 

Flooded Lawn Repair

Posted on | by Organic Lawns by Lunseth

Many people in the Twin Cities area are experiencing lawns flooded by heavy rains or the overflow from streams, rivers and lakes. The University of Minnesota Extension Service warns that during periods of high temperatures and sunlight in the summer, water that ponds on a lawn can cause significant damage or loss even within a few hours.

The damage occurs if the temperature of pooling water on the lawn is 80° F. Turfgrass death occurs in only a few days when this happens. The turf can still die even when water temperatures are lower because the water prevents oxygen from being available for the grass.

Other damage that can occur includes:

  • sediment buildup
  • fungal diseases
  • moss and algae
  • weed infestation

Minor flooding may be an indication that your lawn has drainage issues.  LUNSETH’s landscaping crews’ have assessed and addressed this issue for a number of homeowners. Changing a lawns slopes and valleys can prevent flooding issues in the future.

The Extension Service goes on to warn that, in some instances, you may have to wait for a fix. The grasses we typically grow in Minnesota do not establish well in the middle of the summer due to the high heat and diseases that may occur. For instance, LUNSETH recommends waiting to seed until temperatures cool in the early fall (mid-August through early October).

Sediment buildup is likely following flooding and may result in needing to re-establish a lawn when silt has completely covered it. The process the Extension Service recommends includes:

  • aerate in the fall
  • overseed after aerating
  • sodding can be done throughout the growing season

If you’re worried that your lawn has been damaged from too much rain or flooding, Organic Lawns by LUNSETH has the expertise to assess the problem and help you get your yard thriving again.

Organic Methods for Controlling Clover in Your Lawn

Posted on | by Organic Lawns by Lunseth

Clover, particularly white clover (Trifolium repens), is a hardy perennial often found in lawns because it thrives in almost any soil condition and can withstand foot traffic. Some homeowners embrace it because they appreciate its drought resistance and provides food for our pollinators. A field of clover can be beautiful for some, but not for everyone. 

Organic Control Methods
Fortunately, there are several organic methods to control clover in your lawn, promoting a healthy and lush carpet of grass without compromising environmental integrity:

  • Manual Removal: Hand-pulling clover can be effective for smaller patches or isolated areas. Make sure you remove the entire plant, including its roots, to prevent regrowth.
  • Mowing Height: Maintaining taller grass height (around 3 inches) shades the soil, making it harder for clover seeds to germinate and establish.
  • A Healthy Lawn: A vigorous grassy lawn is achieved through proper watering and fertilization.
  • Applying a solution of vinegar (with an acetic acid concentration of at least 10%) directly to clover patches can effectively kill the clover.  Make sure to avoid getting any on your grass because it can damage it too.
  • Multiple applications of chelated iron can suppress some broadleaf weeds, including clover.
  • Patience and Persistence: Organic methods, like most rewarding things in life. Require time and consistent effort. Regular monitoring and maintenance will help prevent clover from taking over again.

Conclusion
The experts at Organic Lawns by LUNSETH help our clients control clover organically by emphasizing soil health, proper maintenance practices, and natural remedies. We always have a tolerance for 5-10% of weeds within a lawn, as our approach cannot control all of them. Many weeds that we cannot control add good diversity to your lawn and support pollinators. By integrating these methods into your lawn care routine, you can gradually reduce clover while promoting a vibrant and resilient grassy landscape. Embracing organic solutions not only protects the environment but also contributes to a healthier and more sustainable outdoor space for you and your family to enjoy.

When to use Rock or Wood Mulch to Protect Soil

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Soil requires protection from the elements to prevent erosion and nutrient depletion. Grass or alternative turf solutions are typically the answer for most of the yard.  Turf, however, often isn’t an option in other areas like around trees, plantings, home foundations, and on steep slopes and along wetlands. Rock or wood mulch are the answers for these spots and it’s important to know when to use which one.

Rock Mulch

Rock mulch is available in various sizes and types, suitable for different applications. Rock is a good solution for placing on solid black plastic sheeting near foundations to secure the plastic and divert water away. It’s also effective on top of landscape fabric in high-flow water areas, serving as armor to prevent erosion and protect landscaping like swales or rain garden overflows.

Rock mulch is easier to maintain than wood mulch because it doesn’t decompose. It does need to be cleaned out periodically to remove organic material, prevent unwanted germination, and ensure longevity. Cleaning is easily accomplished with a battery-operated blower or rake.

Wood Mulch

Wood mulch is a better alternative to protect soil and plantings. It also offers a softer aesthetic. Its advantages include suppressing weeds, retaining moisture in the soil, and fostering a cool environment for plant roots. Although it’s effective at holding soil in place to prevent erosion it may wash away more easily than rock mulch, making it less suitable for high-flow water areas.

Wood mulch does require seasonal turning to aid in its breakdown and maintain a fresh appearance. Turning involves simply flipping or stirring it with a rake, fork, or shovel.

Both rock and wood mulch, when used appropriately, create microclimates that encourage healthy soil and plants. This prevents erosion and maintains soil moisture in the areas of your yard where grass doesn’t thrive.