​​Underwatering is the most common cause of stress in trees and shrubs we observe in Northern Nevada. It is very often the primary cause that predisposes trees and shrubs to disease and insect problems. It can cause unsightly die-back and result in tree death, especially to younger trees and transplants. If your trees are exhibiting signs or symptoms of poor health at any time of year, its likely related to a lack of water and summer is the especially difficult for trees. We recommend installing a drip irrigation system for deep watering your trees and and shrubs, and having a plan for supplemental watering during the winter.

 

What is Deep Watering?

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Deep watering is watering infrequently, but for a long duration. It is different from how lawn sprinkler systems are designed. By watering for a longer period of time, and then allowing time for the soil to drain, you can ensure that the water is reaching your trees' absorbing roots, and still maintaining a healthy root system with good aeration in the soil. The frequency and duration of the watering depends on the size and age of the tree (and of course the species of tree and many other factors, but let’s keep it simple).

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Most sprinkler and drip irrigation systems are set up to run intermittently everyday. This type of frequent, short duration watering is perfect for lawns and smaller plants and conserving water, but it isn’t ideal when it comes to watering trees for several reasons. One, the water usually doesn’t soak deeply enough to reach absorbing tree roots. Two, when it does, the frequent waterings mean there’s not enough time for water to drain out of the soil causing roots to suffocate from lack of oxygen. Three, it encourages trees to grow a shallower root system that makes them susceptible to uprooting in high winds.

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