Answer: If the soil is poorly draining, cypress is susceptible to root rot. You can check the soil moisture content and drainage by watering as usual, waiting 3-4 days, and then digging a hole near the roots of your trees. If the soil is still moist 3 inches beneath the surface, you won't need to water for a few days; if it's dry, it's time to water; if it's soggy wet it doesn't drain quickly enough and the roots may become starved for oxygen. If this is the case, you'll need to adjust your watering schedule.
Best wishes with your landscape!
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