How to water grass: 6+ Lawn care tips

How long to water grass with sprinkler?

At least 30-45 minutes per zone. In ground sprinklers have larger piping and may only require 15 minutes.

What temperature is too hot to water grass?

There is no temperature too high to water that will affect the health of your grass. Watering in hot or windy conditions will cost more however.

Best time to water your lawn?

Dawn in most cases.

Do I need to water every day?

Only when planting grass seed. Watering your lawn every day can lead to water related problems.

How much water does my lawn need per week?

Properly maintained lawns need about 2 inches of water per week during active growth. Mowing your lawn short, excessive temperatures or excessive fertilizer will increase water requirements.

Do I need to water in fertilizer?

Yes it is important to water in a dry fertilizer, especially synthetic fertilizer.

Maintaining a healthy lawn requires proper watering during periods of drought. When done correctly, watering your lawn can help it grow lush and green. But, doing it wrong can lead to several problems such as disease, root issues, and even fertilizer loss. In this article, we’ll cover some tips and techniques to help you water your lawn correctly for cool season grasses.

Best Time to Water Grass

The best time to water your lawn is in the morning when the temperature is cooler and the wind is calmer. This will save on watering costs. Watering in the morning allows your grass to absorb the moisture it needs before the heat and wind of the day set in. Avoid watering in the evening as this can create conditions that are ideal for fungal growth.

Problems with Watering Your Lawn Too Often

  • Overwatering your lawn can cause several issues. These include compact soil, shallow roots, thatch, and disease.
  • Soggy soil can easily lead to compaction from traffic reducing the air pockets in the soil. This will prevent the roots from getting the oxygen they need to grow. Shallow roots will lead to drought stress during the summer.
  • Thatch is a layer of dead and living shoots, roots, and stems that accumulate on the soil surface. Overwatering can lead to increased thatch because it starves the microbes of the oxygen they need to break down the thatch.
  • Constant moisture will encourage the growth and spread of lawn diseases. This is why it its important to avoid watering at night, or mowing a wet lawn.
  • Additionally, overwatering can lead to fertilizer losses by leaching and denitrification. Denitrification happens in low oxygen soils, converting precious fertilizer into a gas that escapes into the atmosphere.

Why Watering is Important

  • Watering your lawn is important for several reasons. It maintains grass turgor pressure, which is crucial for gas exchange and metabolic functions. Watering your lawn also keeps grass blades cool through evaporation.
  • Water movement in the soil is how most of the nutrients are delivered to the grass roots. Water is also required for transporting those nutrients to the leaves. Proper watering can also make iron and manganese available to the grass, which can prevent the yellowing of the lawn.
  • Water is required for photosynthesis, without it your lawn can not make its own food. It will not matter how much fertilizer you apply if you do not also provide water to your lawn.

How Often to Water Grass Seed

Watering grass seed is essential for proper growth. For the first two weeks, water the seeds lightly several times a day to keep the soil moist. Once the grass begins to grow, water it less often, but make sure to water deeply to encourage the roots to grow deep.

How Long to Water Lawn with a Sprinkler

We recommend running your sprinkler for enough time to provide 0.75 inches(2cm) of water. This is a generalization, if you have sandy soil your lawn will require less water than this. The precise amount of water depends on soil type and temperature. We recommend everyone measure their sprinkler output once and use that as the guide for how long you need to water.

How to Conserve Water with Wetting Agents

Wetting agents help the soil absorb water more effectively, reducing water usage. You can apply them once a month, especially in areas with low water retention.

How Often to Water Lawn in Ontario

The frequency of watering your lawn in Ontario will vary depending on the month. In June, water your lawn two to three times a week. In July, water it three to four times a week. In August, reduce it to two to three times a week.

Best Time of Day to Water Your Lawn

Water your lawn early in the morning, around sunrise. This allows the grass to absorb the moisture it needs before the heat of the day and reduces the time your lawn will stay damp. You should avoid watering in the evening to prevent fungal growth.


Syringing (misting), during the peak heat hours, can also cool the lawn during excessive heat. This will not scorch the grass blades unless you’re using the hot water sitting in the hose. Avoid applying liquid wetting agents during peak heat, this will scorch the lawn.


Watering your lawn requires your attention to avoid overwatering or under watering, both of which can cause significant problems. Be sure to follow these tips and techniques to maintain a healthy, lush lawn.

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