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Yes, you should water your trees whether or not there is a drought. The infrequent rainstorms locally do little to moisten the soil deep enough for trees to benefit year-round. Many of the planted trees in Ventura are from other parts of the world where rainfall totals may be higher. Even native trees need supplemental water now and then. If we water trees regularly and appropriately we can prevent issues that can occur during an extended drought.
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Watering your tree with lawn sprinklers will not provide enough water for the tree. Sprinkler water does not soak deep enough into the soil to reach tree roots, and these ground covering plants use up the water before the tree can get to it.
Sometimes these areas are covered by our homes, driveways, sidewalks and other impervious areas, in these cases do the best you can. Watering in a lesser optimal location is better than no water.
If you notice these conditions occurring in your tree, check the soil moisture to see if there is enough to support water uptake. Refer to the question above, "How can I tell if my tree is getting enough water?" for information on checking soil moisture.