Western red cedar (Thuja plicata) is celebrated as the 'Tree of Life' in Pacific Northwest heritage, known for its fragrant, rot-resistant wood and dense, emerald foliage. But over the last several years, homeowners throughout Olympia, Lacey, and Thurston County have noticed unsettling changes: majestic cedars turning rust-brown and dying from the top down.
Scientists tracking the Pacific Northwest Cedar Dieback Map have identified changing climate patterns as the primary root cause. Western red cedars possess shallow, fibrous root systems that rely on consistent spring and summer soil moisture. In response to prolonged July-through-September dry spells, cedar rootlets shrivel, cutting off hydration to the topmost branches.
The initial symptom is 'flagging'—individual interior branches turning bright reddish-orange in late summer. While minor flagging is normal annual foliage shedding, severe dieback shows entire outer branch tips browning, top leader shoots dying ('candling'), and resin weeping through trunk bark.
As cedars weaken from water stress, secondary opportunistic pests strike. Cedar bark beetles (Phloeosinus species) invade drought-stressed cambium layers, while cedar armillaria root disease attacks weakened subterranean root systems, accelerating total tree death.
If your property features declining cedars near homes, driveways, or fences, professional evaluation is critical. Dead cedars rapidly become brittle, dropping heavy top sections in high winds. Our team can assess cedar viability, prescribe deep-root irrigation regimens, or safely remove dead specimens before they fail.