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    Trees and Development
    ISA Members: $49.95
    Non-Members: $59.95
    Price in US Dollars

    Climbers' CornerTree Academy

    Retrenching Hollow Trees: An International Practice


    As trees age, outer branches are shed as inner crowns emerge. We will examine this phenomenon in many trees around the world.  Sustained routing after pruning overextended branches  results in retrenched and rejuvenated landscape trees. Even clients with low risk tolerance are willing to retain hollow trees when reasonable specifications are communicated and carried out. Hollowness occurs naturally, as taproots and heartwood are shed. Buttresses and adaptive growth provide needed support. The TRAQ form will be used with several species to document response growth, specify mitigation options, assessing and managing residual risk. Vital parts include the flare, the forks, and the vascular pathways in the living tree. Dr. Kevin Smith’s review of the US version.   

    Conference Proceedings Documents


    Guy Meilleur is an ISA Board-Certified Master Arborist, and a Municipal, Tree Climbing, and Utility Specialist.  He is a former staff arborist at University of North Carolina, Instructor at Duke University, and sometimes writes as Detective Dendro.

    Historic Tree Care provides diagnosis, soil improvement, pruning, support and lightning systems, report writing and community education services.


    Climbers' CornerTree Academy

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