It requires cool nights to recover from daytime heat. If the night stays warm, the grass can't make the energy it needs to grow the next day. Turf expert Clint Waltz calls it “summer swoon of fescue”. Thinning is a survival mechanism caused by water stress and exposure to high temperatures.
Lawns with Tall Fescue thrive when daytime temperatures are 60-75 degrees. Above 75 degrees Tall Fescue will struggle. Above 90 degrees the grass may go into dormancy to protect itself. If it is too hot for too long, there may be permanent damage.
Consistent and well-timed watering, proper mowing practices, and removing clippings can help reduce the frustration that often comes with fescue care. Embrace these strategies, and your fescue will be better equipped to withstand the summer heat and thrive in shaded areas.
This is normal for fescue once it starts getting too hot. Looks like heat stress/dormancy - especially if you are getting full sun. My front yard is fescue as well. Cool season grasses will turn brownish due to the heat and will also go into dormancy if they are struggling.
Though tall fescue will tolerate some periods of hot temperatures, it cannot handle extended periods of soil temperatures that rise above 90 degrees. When soil temperatures stay above 90 degrees, tall fescue begins to go dormant, shutting down, and turning brown to tolerate the hot temperatures.
It's okay to use a low nitrogen fertilizer such as 5-10-30. We know you love to apply products, so want to take another chance to steer you toward applying fungicide instead of nitrogen through summer. Review the fertilizing schedule in our Tall Fescue Maintenance Guide.
Overall, the ideal tall fescue mowing height is 3 – 3.5 inches. This is a safe length to mow your tall fescue any time of the year. Most lawnmowers do not mow higher than 3.5 inches, so keeping your mower deck to the highest setting will ensure your tall fescue is always at a healthy height.
Grass that is dead will not come back, but there are steps you can take to have a lush, green lawn again. On the other hand, dormancy is a natural protection mechanism for grass to withstand weather changes.
But an overwatered lawn will have a shallow root system that is weak and unhealthy. This is when the lawn will start to turn yellow. It's also common for an overwatered lawn to develop more significant layers of thatch and to be prone to pest problems. Excess water also leaves the grass much more prone to lawn fungus.
In many cases, the turf recovers on its own after a couple of weeks, especially after a change in the weather, like starting in early September when the nighttime temperatures start to cool off.
Dormant grass can start to green up within 7–10 days with proper watering and care. If the grass is dead, it requires reseeding, fertilization, and consistent maintenance, which could take weeks or even months.
Water your fescue lawn with 1.5 inches of water per week. Water in the early morning. Watering your lawn once per week deeply is better than frequent shallow watering. Use preventative fungicides.
Start by raking dead grass spots to loosen the soil and remove the expired blades. Lightly rake the healthy areas to get rid of dying grass and aerate the soil for root stimulation. Once you have the land prepared, take a rotary seed spreader and lay down new grass seed over the dead spots.
Cons of Choosing 90-10 Tall Fescue Sod. While it can tolerate partial shade, it won't do well in full shade. Additionally, it's not as tolerant of diseases and insects as some other types of sod, so you'll need to be extra diligent about pest control.
When life in your full sun isn't just about basking but grappling with real heat and foot traffic, tall fescue reigns supreme. Its roots are deep, as if it plunders the core of the earth for sustenance. Not really, but it goes much deeper than other grass roots, making it drought-tolerant and heat-resistant.
Heat Tolerance
Bermudagrass is extremely heat tolerant — daytime temperatures of 95 to 100 degrees Fahrenheit are optimal. Pennington Bermudagrass Grass Seed yields dense, resilient, heat-tolerant lawns. Zoysia grass, Centipede grass and Bahiagrass also tolerate high heat very well.
In general, a fescue lawn will need about an inch of water every 7-10 days, whether from rain or irrigation. Try to water deeply and infrequently. For example, apply an inch of water on a single day rather than . 25 inches a day for four days.
Conclusion: Achieving a Healthy Lawn
Recognizing the signs of an overwatered lawn is crucial for making necessary adjustments to your watering habits. Overwatering can lead to numerous lawn problems, but with the right care, you can restore your lawn's health and enjoy a lush, green lawn.
You most likely have a common lawn fungal disease! It is called 'Brown Patch' in Tall Fescue or Zoysiagrass and 'Summer Patch' in Kentucky Bluegrass. These fungi attack your lawn when weather is hot and humid during the night.
Rhizomes are small underground lateral shoots that allow a plant to spread laterally. This enables the turf area to self repair itself. This self healing trait has been limited to bluegrass. Fescue, which is classified as a "clump grass" has never had this ability.
Yes, your grass will eventually grow back, even if you don't do anything about it. However, flushing it out with water and reseeding will speed up the process tremendously. If you don't want to reseed, you can also aerate the soil in the affected area to speed up the regrowth.
Fine fescue: It usually stops growing when temps exceed 90 F or drop below 50 F. Tall fescue: It stops growing once temperatures reach 90 F or drop below 50 F.
Mow Properly
Using best practices for mowing helps your grass grow thick and stay that way.
However, if you're comparing perennial ryegrass vs. fescue, you really can't go wrong with either in a high-traffic situation as fescue is also quite durable. Earth Development knows fescue is also used for school playgrounds and sports fields and is also often used as a pasture grass for horses and cattle.
Mowing - Mowing your lawn at the correct height creates the appropriate canopy needed by your Fescue lawn to promote root growth and improve weed suppression. And lawns mowed at the right height also require less watering. This is important year-round.