A: If you are only mowing one property and depending on the size, once a year should be plenty. Cleaning and sharpening the lawn mower blades should be scheduled, at least, with the time of tune up to the mower. When grass blades don’t get a clean cut, their end become frayed. The split ends of the grass opens the door to disease and becomes weaker against other stresses. In order to tell if the blades of the lawn mower need sharpening, look for frayed ends on the grass after a mowing. Keep in mind, if you go a long time without mowing and grass gets long, this could lead to split ends as well.
A: By mulching grass clippings, you are keeping nutrients in the soil longer. Many think it may contribute to the thatch layer since dead grass clippings may come up when you de-thatch, but is not necessarily causing the problem that are associated with thatch. The grass clippings decompose and adds organic matter to the soil, increasing the availability of nutrients in the soil. A significant amount of grass clippings would be needed for it to cause problems associated with thatch.
You want to avoid going more than 10 days, during the growing season, without mowing. By the time two weeks comes around, there may be too much grass to mulch. This would be the only time you want to bag. You do not want clumps of grass clippings! The clumps will smother out the grass underneath and could eventually kill grass. Wet clumps will make matters worse! Also, mowing when the grass is high, could lead to frayed ends of grass blades, making the lawn more susceptible to disease.
How much water does grass need?
The watering schedule depends on the type of soil, sandy or clay, and whether the property is flat or on a slope. If too much water is applied, nutrients will leach through the soil faster, taking them too far down for grass roots to reach them. With too much water, grass won’t be as green, may lead to disease, and it will encourage weeds to thrive in that area. Not enough water will cause grass to go dormant and turn brown, eventually leading to death. Depending on the age and type of grass, sometimes grass can survive a drought. In order for grass to survive a drought, nutrient and pH levels need to be optimum and grass needs a couple of years or more under its belt for the roots to get fully established. So if you have fairly young lawn, make sure grass is taken care of during the summer months until roots are well established.
*Schedule is for an irrigation system that is properly installed/adjusted with good water pressure.
**Sprinkler heads that rotate a full 360, require twice the amount of time.
SANDY SOIL: Water leaches through the sand much faster than other soils. This requires less water than other soils to get the soil moist four inches down where the roots extend. Unfortunately, sandy soil dries quicker than other soils. Instead of increasing the time the lawn is watered, just water more frequent. When temperatures are in the 90’s and above, you may need to be watering twice a day, 15-20 minutes each zone. In cooler weather, water once a day for the same amount of time.
CLAY SOIL: You have to use heavy watering to get where the roots extend. When temperatures are above 90 degrees, you may need to water once a day, 30-40 minutes each zone. Below 90 degrees, water once every other day, for the same amount of time.
SLOPE: See sandy soil. This will prevent water runoff.
Every lawn should be watered as early as possible, 4-7 am is ideal. If you have to water twice in one day, water a 2nd time 12 hours later. Watering in the afternoon, when the sun is at its strongest, could have the reverse effects. Wet grass could act as a prism for the beaming sunlight and make it easier for the sun to burn up your lawn.
If an in-ground sprinkler system is being used regularly, DO NOT assume it’s watering your lawn perfectly! Sprinkler heads have to be properly adjusted every year. If browning occurs on an irrigated lawn, check to see how the heads are spraying. A sprinkler system is only as good as it sprays! It can be such a fine adjustment, not even noticeable unless studied, that can make a world of difference. This is may only be a problem during hot, dry months. Soil with optimum levels for soil pH and nutrients, a well balanced lawn care program, and an irrigated lawn should not have browning! In just about every heat stressed lawn you can find disease and more often than not, turf disease is brought on as a result of the heat stress. Once grass is hit with one stress, it is very susceptible to other stresses (disease). Please compare these two photos.
Photo A, no bueno! Notice the difference between A and B, the vertical spray. In photo B, from the start of the sprinkler head to where the water ends, grass is getting wet and it is noticeable. If you cannot see the mist between the top of the spray and the grass, it is not enough water! That mist should be easily visible. The condition of the sprinkler head, water pressure and the proximity of the sprinkler heads all play a role into creating an effective irrigation system. Photo A will also cause issues when seeding in the fall time!
SIGNS OF HEAT STRESS
Gradual browning in-between brown spots is a clear indicator of heat stress. Textbook disease still has green around brown spots. Now, you will always find disease in heat stress, but when grass is stressed out, it can easily get sick, like us! Take a look at pics below, sections of brown, then sections of green. Same amount of sunlight, why disease in just one spot? The type of grass does play a role and small sections of certain types of grass can have similar browning, but that is not the case in these pictures. If you have these issues, don’t increase the duration of your water schedule! Over watering will cause more problems by watering down the products, increasing the chance of disease, and it will bring on more weeds. Adjust the heads, check water pressure and make sure heads are not too far apart (up to 20′). This is, by far, the most common problem in summer months, especially during long, hot periods with no rain.