We tried this in an old what we call asphalt parking lt that was 270 degrees
around an old Ilex opaca; 400mm centers and filled with expanded slate
aggregate, the main ingredient of "structural soil" over here.
It was 3/4"; er 25 mm? size chunks and compacted for traffic but recessed to
allow tree dander (funny but seems pejorative) to rot; that was part of the
plan, along with compost in the bottom of the holes. lost permeability
judged to be a minor factor and so it was--tree was in steep decline when met
and it did not slow down much; died in 2 years regardless.
Yes vacuuming that resinbound aggregate to avoid clogging could easily fall
off the maintenance list, and then what?
Guy Philip Meilleur
ISA Board-Certified Master Arborist #SO-0284BMUT
ISA Certified Tree Worker & Utility & Municipal Specialist
Member, American Society of Consulting Arborists
Better Tree Care Associates, www.bettertreecare.com
"Facilitating the coexistence of trees and people"
PO Box 1287, Apex NC 27502
919-387-7045, 906-0465, email@example.com
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