“Keeping grass a little longer in the heat of summer helps,” explains Williams. “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.” Williams recommends a blade height of about 4 inches during the summer months.
Mower Height
A mowing height between 2.5 to 3 inches is best for most of the season, except during summer stresses when the lawn mowing height should be raised one-half inch to mow at 3 to 3.5 inches. Raising the mowing height provides more insulation from summer heat and reduces water loss from your soil.
Although a low-cut, manicured lawn might seem ideal, turf grass actually does better in the summer heat when you let it grow a bit. Longer shoots mean deeper roots, which the lawn needs to suck up whatever moisture is in the soil. A higher lawn also shades the soil, minimizing evaporation.
The simple answer to this question is NO. Allowing your grass to grow too long between cutting creates lawn care problems that no homeowner wants to deal with.
Proper Mowing
Mow the lawn as high as possible—as high as you can comfortably tolerate. A longer lawn means more leaf blade, and this provides several benefits. More leaf blade means more photosynthesis, which results in stronger, more prolific root and shoots growth.
Mowing actually helps make your grass grow thicker because the tip of each blade contains hormones that suppress horizontal growth. When you cut the lawn, you remove these tips allowing the grass to spread and grow thicker near the roots.
For this reason, some people prefer to mow at 3 or 3.5 inches. For the healthiest and most sustainable approach, Michigan State University Extension says 3.5 to 4 inches is most desirable. Lawns mowed at 3.5 or 4 inches out-compete weeds, tolerate grubs and look just as good as lawns mowed at 2.5 inches.
Mowing Correctly
Over time, mowing helps create deeper, thicker roots. Never cut over a third of your grass turf when mowing your yard. Leaving your grass a bit longer gives it plenty of time to absorb sunlight and shades the soil so it can retain water longer.
Mowing every two weeks — instead of weekly — and not dousing grass with chemical herbicides and fertilizers, helps the environment and supports the health of bees, which are among the world's most important pollinators.
Grass Goes to Seed
In periods of stress such as unusually hot weather or being allowed to grow too long, grass can go to seed. This results in the grass looking more like a weed with its small white flowery stems.
If the grass is too wet, you shouldn't mow and if it's too dry you shouldn't either. Remember, mowing is a stressful event for your lawn. If you mow when it's already under stress, such as during dry spell or drought, then it will become even more stressed. You don't like to be stressed and neither does your poor lawn.
Once temperatures reach 77 degrees, it becomes too hot for root growth, and root growth ceases. When temperatures reach 90 degrees, it becomes too hot for shoot growth and the grasses stop growing and begin to fall dormant, with the surface grass turning a brown hue.
No Mow May was first popularized by Plantlife, an organization based in the United Kingdom, but is now gaining traction across North America. The goal of No Mow May is to pause mowing during the month of May, allowing flowers to bloom in your lawn to help early season pollinators.
Frequency of Mowing
Typically, mowing once a week during the growing season should suffice to keep your lawn healthy.
A longer lawn means that the individual grass blades (the leaves) have more surface area for photosynthesis to occur. Increased photosynthesis results in more plant growth, a more extensive root system, and a healthier plant.
Long Grass Problems
This causes it to droop onto surrounding grass, smothering it. When long grass droops, it also traps moisture in lower areas, which can cause fungus and disease to spread. At this length, grass also looks unseemly. It may grow unevenly or turn yellow or brown.
If you cut down an oak tree or if a deer eats the tree and damages it enough, the stump dies. But if you cut grass, you don't hurt it at all. That's because new growth on an oak tree is at the tips of the branches; new growth in grass happens at ground level.
What Nutrients Does Grass Need To Grow? There are three top nutrients grass needs to grow; potassium, nitrogen, and phosphorus. Though all plants need these three key nutrients to thrive, grass requires higher concentrations for proper growth.
Lawn clippings usually do not need to be bagged. Recycling lawn clippings can reduce your fertilizer needs and improve your soil. Recycling clippings to the lawn does not contribute to thatch. If you must remove clippings, they can be composted or used as mulch.
The best natural defense your lawn has against weeds is overall lawn health. A healthy, thick lawn that is between 3-4 inches tall shades weed seeds so they die out before they can germinate.
Can You Water Grass After Mowing? Yes, you can water grass after mowing, however it is healthy to water it but only if it requires it. Watering will help the mowed blades perk up and survive being cut better. Take care not to water a lawn overwatered or from noon till late into the night.