Proper Watering & Mowing is essential to a Green, Thick and Healthy Lawn.
Here are the facts for watering lawns in the Greater Toronto Area (and similar growing districts with cool-season grass varieties)
You need to water at least once a week for at least an hour, this generally provides 1″ of water to the roots (a tuna can height) (exceptions: 1. when you seed & 2. if you have an automated system).
The deeper the roots- the less often you will need to water- and a healthier lawn withstands drought. Deep watering encourages deeper roots as they grow deeper into the soil to search for water. Deep roots enjoy the lower soil temperatures during the heat of the summer and less fluctuations in moisture levels and temperature.
Watering in the morning is best- this allows the water to trickle deep into the soil and allows the leaves of the grass plant to dry before the water evaporates as it gets warmer in the day. If you cant water in the morning the night time is OK just try to do it earlier! (better to water than not water at all).
Amount of Water
All lawn areas require 1”- 1.5″ per week. This is best done in one to two watering’s per week depending on your soil type. The trick here is to water deeply so that the roots grow down deeper into the soil to chase the water, thereby leaving more soil above them to protect them during periods of dryness and excessive heat. (Sandy soils drain quicker, therefore must be watered more frequently.)
Use a timer
Hose end or hose-bib timers are available at major retail hardware stores and allow you to water your lawn while not at home. Simply attach to your tap before you attach your hose. When you leave in the morning, set your sprinkler out at the desired location, turn the timer on to 60-120 minutes and leave for the day. You can rest assured that the lawn will get the water it needs and you don’t have to remember to shut it off.
See our Irrigation and Lawn Sprinkler section for information on a professionally installed sprinkler system by LawnSavers.
It is extremely important that a newly seeded lawn be kept moist but NOT SATURATED, until the seeds begin to grow. After the seeds have germinated and have begun to establish a root system, reduce the frequency of watering. Applying too much water will only inhibit germination and promote disease. As you reduce the watering frequency you should also increase the amount of water applied each time.
6-8 weeks after planting treat your lawn like an established lawn.
Deep, infrequent watering is typically best for most lawns. On average, a lawn needs about 1 inch of water a week during the growing season, either from rain or irrigation. This 1 inch of water normally soaks the soil to a depth of 4-6 inches, which allows the water to reach deep into the root system.
You must determine the rate of application of your sprinkler system to set up any irrigation program. An easy way to determine the rate of your sprinkler system is to set out a series of equal sized containers (cans, bowls, etc.) if you use a single sprinkler. Run the system for 30 minutes and then measure the amount of water in the can and adjust your watering time to reach the desired level. With this little “can test” and a little simple math you can determine the length of time it takes to apply 1 inch of water.
Watch for runoff during the watering period. It is very possible that your lawn will not be able to soak up the water as fast as your sprinkler is putting it on the lawn. If this occurs shut off the sprinkler for an hour and then turn it on again. If you have an automatic system, have it cycle through the stations again.
Also, remember that sloped areas will have more tendencies for runoff. The best times to water your lawn is in the early morning or early evening when there is generally less wind and heat. The least desirable times are in the heat of the afternoon, when water evaporates too quickly and very late in the evening, which can cause the lawn to stay wet all night. This may encourage disease development.
As each lawn area is unique, there are no formulas or automatics for determining a watering schedule. Keep in mind that fenced lawn areas and shaded turf generally requires less water than do lawns in full sun. The best schedules are those determined by observing the appearance of your lawn.
Lawns that are watered sufficiently generally are healthy and uniform in color and growth. Whereas lawns that are under-watered will typically be uneven, with areas of poor or little growth. Often a poorly designed irrigation system or plugged or damaged sprinkler heads causes this condition. These problems are frequently identified when a “can test” is conducted.
There are several easy methods to help determine your lawns need for water. Push a soil probe or old screwdriver into the soil in areas that look dry and also into areas that look lush and healthy. With soil that has ample moisture, it is generally very easy to push a probe or screwdriver into the soil, whereas soil that is dry is typically very difficult to push into the ground. Turf that is moisture deficient will also not spring back up after walking on it.
Once you have identified and corrected sprinkler coverage problems, you are now in a position to set a watering schedule. Remember deep watering’s are typically best for most lawns throughout the year. Observing your lawn is the key to adequate watering. After a series of long watering’s, stop. Each day check your lawn for signs of water stress. Areas of blue-gray color and thin, curled leaves are the most common early signs of water stress. When these “hot spots” first appear, you will know that your lawn should have had a deep watering the day before.
This is a basic guide for setting up the intervals between watering. Keep in mind that this interval will change with the season, with the shorter intervals coming in the summer heat. Also be mindful of weather changes; be they summer rains, hot, dry winds or unusually long dry spells. Be ready to respond with changes in your watering program. You’ll have a healthier, more beautiful lawn, and be conserving water at the same time.