Seasonal Guidance for Water Wise Irrigation

January & February

  • Turn water off unless no rain predicted for month; adjustment setting = 0%

  • Let soil dry before turning water on again

March & April

  • Start using your irrigation controller on a regular basis unless it's raining.

  • This is an active growth period; water deeply to allow plant roots to grow deep; but water infrequently and let soil dry before next watering.

  • Adding a rain sensor to your irrigation controller will allow the system to automatically (but only temporarily) shut off when it rains.

May & June

  • Regular watering usually required, but less watering needed if fog lingers or weather is overcast.

  • Allow water to soak in slowly in order to avoid run-off onto paved surfaces.

  • "Cycle" the irrigation timers to turn on twice (one hour apart) on each watering day, with each cycle set at ½ of the total time for a single watering.

July & August

  • Highest levels of watering probably required at this time of year. Your watering schedule for July/August constitutes the "100%" amount for your watering adjustment factor, which can be changed weekly based on the "Weekly Percent Adjust" on www.WaterWiseSB.org

  • Water only in early morning hours (before mid-morning); divide watering time into 2 cycles one hour apart on each watering day.

  • Less water is required for established plants, water wise plants, and/or native plants which are accustomed to dry summers.

September & October

  • Less water needed for established trees/shrubs; more water for young plants.

  • Plants' water needs drop due to shorter days and cooler temperatures.

  • But dry winds, often occurring in fall, can dry out plants & soil, thus requiring more water. Weekly Percent Adjust accounts for all weather factors.

November & December

  • Plants shift to dormant phase; their water needs drop.

  • Lower evaporation means less water needed.


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