Answer: Water stress is typically the reason for sudden browning in a Leyland cypress. This could be droughty conditions or overly wet soils. Leyland cypress has a deep root system and should do well if you water them deeply once each week. If you haven't already, make watering wells or basins beneath each by mounding up a few inches of soil in a circle around the trunk, about 12" away from the trunk. Fill the basin with water, allow to drain, then fill it a second time. This method of watering concentrates the water directly over the rootmass and allows it to trickle down, wetting the entire root area. Once each week should do it. Hope your plants respond favorably in a short time!!
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