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Killing Large European Ash Without Cutting: Girdling and Herbicide

50-ft European ash with treehouse. Want to stop growth (protect patio, treehouse) but keep standing. How to kill?

Method: Girdle + Herbicide

Cut bark→wood all around trunk, 2" gap
Paint Roundup (glyphosate) in cuts → translocates to roots

Timeline and Risks

Southern US: falls in 2 yrs
Western US: may stand 10+ yrs
Branches die first → fall hazard
Treehouse supports added – wise

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