Drought Injury

Drought stress in conifers like noble fir, western hemlock, and western red cedar typically begins at the canopy top and branch tips where water has the furthest distance to travel through the tree. Needles yellow and drop prematurely, and you'll notice the outer crown thins faster than inner tissues die. Even when the entire visible canopy appears dead, roots may still be alive, though trees in this condition rarely survive long term. Winter injury, root weevil damage, and gopher damage can mimic these same symptoms exactly.

The challenge here is untangling drought stress from opportunistic pathogens and insects that attack weakened trees, making it hard to know which problem is truly responsible for decline. Newly planted trees are most vulnerable, particularly Leyland cypress hedgerows in the Puget Sound where competition and intra-tree shading compound moisture stress over several years. Deep, infrequent watering, mulching, and soil amendment with organic matter build resilience; planting drought-tolerant species on thin or rocky soils prevents the problem entirely.