Tree Trimmer
ArboristSite Member
Originally posted by John Paul Sanborn
over 30% loss of cylinder strength is concidered to be critical in a hollow tree, maybe 20 inches and over would be better.
30% shows up at 12.2 inches. You probably wouldn't need to girdle something that small anyways. The tree would likely be on the ground before there was a significant amount of sap flow anyways.
TT