Watering Blue Spruce
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You should water your spruce and all trees and shrubs at least once a month when the ground is not frozen, has no snow on it, and temperatures get to 40 degrees. You will want to water by mid-day so the water has a chance to soak into the root zone.
You can also help protect your evergreens with a anti-desiccant or anti-transpirant sprays that will help provide protection from wind and sun and slow the evaporation of moisture from the needles.
Enjoy your new trees!