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Old 05-29-2015, 10:53 AM
 
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I have about 0.2 acre lawn that I need to irrigate.

Please suggest a good strategy on timing, duration on watering the lawn/plants...

Is it a good idea to schedule the irrigation system in the early morning or during the day or evening or in the night time?

Should I need to schedule the water on a daily basis or once a week?

How long the irrigation system should be be scheduled for... 10 minutes or 20 minutes or 30 minute??
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Old 05-29-2015, 02:22 PM
 
Location: East of Seattle since 1992, originally from SF Bay Area
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It depends on the output of your sprinklers, which can vary. In normal weather at about 70-80F the lawn needs 1" per week. A good way to determine that is to place an empty tuna can on the lawn, with a felt pen mark at 1" inside. Turn on the sprinklers and start a timer, let it run until the water in the can reaches 1". Stop the timer, and that is how long you need to water once a week. In hotter weather it may be twice a week, but always long enough for 1".

Watering in the evening means wet all night, which reduces loss to evaporation but can lead to more diseases. I like early morning, before sunup, so that the water soaks into the ground with minimal evaporation, but the surface dries out soon after.

Other plants and shrubs also vary by type. Some are more drought resistant, other need a lot of water. Younger trees have shallower roots and need watering more often than large, established trees. Watering by hand with a hose will take a lot less time than a soaker hose, which is less time than a drip irrigation system. Most plants will show stress by drooping leaves when they need water, but evergreens like pine/cedar/fir trees can remain green even weeks after dead.
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