Summer heat stress can be a problem, especially in July and August. Heat, dry weather, and foot traffic are major stresses for most types of grass. Others include weeds and bugs, but they can become worse when your lawn is already suffering.
Grass and Heat Stress
Extended periods of heat and humidity, bright sunshine, warm nights, with no rain can add up to trouble. Warm season grasses may love these conditions, but in the northern zones, cool-season grasses become stressed, wilted, and prone to disease.
The heat and lack of rain call for watering, but the excessive moisture has the ability to create disease conditions.
During the summer, grass utilizes the energy stored in its root system, sustaining the plant but shrinking the root system, making the turf vulnerable.
Here are some tips for dealing with summer heat:
Keep Grass Longer. Keeping grass a little longer in the heat of summer helps. The roots extend deeper into the earth, keeping weeds from coming up and competing for water. And because the turf is denser, it requires less water. Try a blade height of about 4 inches during the summer months.
Sharpen Mower Blades. A sharp blade is always important, but never more so than during hot summer months. Dull blades can cause grass to fray. Frayed grass is far more likely to brown.
Mow Early, Less Often. Mow less frequently and cut early in the day or hold out until the sun begins to go down. Freshly cut grass is more likely to sustain damage in the hot sun, and keeping the lawn cool will cut down on those brown spots.
Consider Mulch. Instead of bagging grass clippings, use a mulching mower. Allowing mulched grass to settle into the lawn will help trap moisture, keeping the lawn cooler and better hydrated. A mulching mower can be beneficial to the lawn all year long but is especially helpful for beating the summer heat.
Skip Fertilizing. Depending on the type of grass, you can probably skip fertilizing during the summer. If your lawn is having trouble, before you get into fertilizers, have the soil tested first to see if there are deficiencies. If fertilizer makes sense, look at organic, time-release fertilizers to avoid burning your lawn.
Water Wisely. Most lawns require about an inch of water per week to stay healthy. An irrigation system is ideal for lawn hydration, but no matter how the lawn is watered, time of day makes a difference. Despite what some say, watering during the hottest part of the day won’t damage grass, but rapid evaporation can be an issue. Deep, infrequent watering during morning hours allows moisture to be more efficiently absorbed by the root system