Quesnel Lawn Care

Quesnel Lawn Care

The Ultimate Guide to Watering Your Lawn

July 12, 2023
Lawn Care Tips

Watering Outdoor Plants

The question of how much to water and how often has no single answer. It depends on weather conditions, soil composition and the plants themselves.


1. Weather: On a hot, sunny day in midsummer, the average lawn uses 125 gallons of water per 1,000 square feet. The same lawn on a cool, cloudy day uses as little as 10 gallons of water. Mature trees can use up to 15 gallons of water per hour on a hot day. Any plant exposed to hot sun, low humidity and strong winds will evaporate large amounts of water that must be replaced from the soil or it will die. Grass is particularly susceptible since 85% of its bulk is water.

2. The Plants: A good drenching once or twice a week is better for your lawn than daily light sprinklings. Deep watering produces strong, deep root systems that can safely withstand drought. This requires a long, thorough soaking of the soil, ideally to a depth of about 1 foot but at least 6 to 8 inches. A steady stream of water will run off. An even, intermittent sprinkling is best for deep penetration.

3. Soil Type: Coarse, sandy soil has large air spaces that quickly fill with water but also lose water quickly to the subsoil requiring shorter, more frequent watering. Heavier clay or silt soil has numerous smaller spaces that absorb water slowly but hold more water than sandy soil. Clay soil should be watered slowly but less frequently. Loam-type soil falls in between, holding water longer than sandy soil but not as long as heavy clay soils.

Let the soil dry between watering. Roots will grow deeper, looking for water below the surface as soil dries. Roots need to absorb small amounts of oxygen from air spaces in dry soil and are warmed by the drying soil. This also discourages weeds, which are often shallow-rooted.    

Light watering produces shallow roots in the upper few inches of soil that are subject to rapid drying. In addition, many weeds have shallow roots that thrive on moisture near the surface. Too-frequent watering produces wet areas susceptible to lawn diseases, insects and drown root damage.


When to Water

Most lawns need 1 to 2 inches of water per week depending on water and soil conditions. Nature supplies water as rain or dew but sometimes doesn't supply what's needed. In dry areas, a regular watering of at least once a week or more is important (skipping days when it has rained heavily). During the more moderate spring and fall or in cooler, wetter regions, look for signs that watering is needed. A slowing of the growth rate, changes in color or loss of resilience (footprints showing in the grass) are signs water is needed. Check the soil 2 to 6 inches below the surface. If the soil is dry and crumbles easily, it's time to water.

Time of Day

  • Early morning is best because water pressure is high, it's still cool so evaporation is low and seepage into the soil is best before the sun bakes the ground hard.
  • Late afternoon is the next best time, but be sure that it's early enough for the leaves to dry before nightfall.
  • Night watering is not recommended because the lawn and other plants stay wet for a longer time, promoting lawn diseases.
  • Midday watering usually doesn't hurt anything. In the heat of the day, a great deal of water is lost to evaporation before it soaks into the soil.


How Much to Water

watering spray bottle misting

If nature hasn't supplied water as rain, apply approximately 1 inch of water, (a general rule of thumb). This will give deep penetration of the soil to a depth of 6 to 8 inches. One inch of water or rain is equivalent to 623 gallons per 1,000 square feet. Water should be applied no faster than the soil is able to absorb it. If water begins to run off before 1 inch is applied, stop sprinkling until it's absorbed and then resume. 



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