The rule of thumb in watering is to set irrigation to water more frequently as temperatures rise. (The amount of water supplied stays the same; it is the frequency of watering that change with the seasons). Be sure to water around the outer reaches of a plant’s canopy, where feeder roots can absorb it. Water should soak 1 foot deep for shallow-rooted plants such as cacti, Succulents, annuals, and perennials; 2 feet deep for shrubs; and 3 feet deep for trees. Use a soil probe to determine how far water penetrates. The probe will easily move through moist soil but stop at dry hard soil.
During periods of extreme heat or wind, increase length of water time. Turn off watering system at the clock during wet periods. Note: Don’t forget to turn clock switch back on after any reprogramming of timer.
Watering Schedule: first check periodically for plant and tree stress from too little or too much water.
Signs of Under Watering
• Soil is dry.
• Older leaves turn yellow or brown and drop off.
• Leaves are wilted.
• Leaves are curled.
Signs of Over Watering
• Soil is constantly damp.
• Leaves turn a lighter shade of green or turn yellow.
• Young shoots are wilted.
• Leaves are green yet brittle.
• Algae and mushrooms are growing.
Plants can use three to five times as much water during the hot summer months as they do during the winter. Adjust your watering schedule with the seasons and when there are more significant changes in the weather.