Watering is where good intentions most often work against a lawn. Light, daily sprinkling keeps the surface wet and encourages shallow roots that dry out quickly. The widely published alternative is the opposite habit: water less often, but soak deeply when you do.
How much, and how often
Health Canada's guidance is to apply at least 2.5 centimetres — about one inch — of water, and to water only when the lawn needs it, usually no more than once a week when there has been no rain. Too much watering, the same guidance notes, can lead to poor growing conditions and disease problems by starving the soil of oxygen. The goal of a single deep soak is to wet the root zone and then let it dry before the next watering, which draws roots downward in search of moisture.
The tuna-can method
Place an empty tuna or pet-food can on the lawn while the sprinkler runs. When the can fills to roughly 2.5 cm (1 in), you have applied about a week's worth of water. Time how long that takes, then reuse the timing on later weeks. This measuring trick comes directly from Health Canada's lawn guidance.
Water in the morning
Timing matters as much as volume. Health Canada recommends watering in the morning, which reduces water lost to evaporation and wind, and notes that evening watering leaves the grass wet for longer and raises the risk of disease. Morning watering gives the blades time to dry through the day rather than sitting damp overnight.
Adjust for soil and slope
One inch a week is a starting point, not a fixed rule. Health Canada notes that grass growing on compacted, fine soil or on slopes needs lighter, more frequent watering, because water runs off before it can soak in. Grass near large trees may also need more water, since tree roots absorb much of the moisture in the soil.
Brown is not dead
During an extended hot, dry spell, a lawn may wilt, turn brown, and go dormant. Health Canada points out that a healthy lawn can survive several weeks in this dormant state, and that common varieties such as Kentucky bluegrass and fine fescues green up again once regular moisture returns. Reaching for the hose at the first sign of browning often does more harm than simply letting the lawn rest.
Check local rules first
Many Canadian municipalities set seasonal watering schedules or restrictions during summer. Before settling on a watering day, confirm the current rules with your local water authority — they take precedence over any general guideline.
Watering works alongside cutting height: a lawn kept at a healthy height holds moisture better, so the two notes reinforce each other. See the mowing height note for the companion practice.