Boa07
ArboristSite Operative
Wouldn't it be great if a company with the research resources like Barlett Trees were to take on your idea of the sink holes and run a 5-10yr test project to see just what happens with some of the more common street trees in soil profiles where it could be possible the vertical drills might enduce deeper rooting, with control trees in the plot with no drills similar to their root barrier and concrete footpath test from a while back.
It would not be proof of the application in all conditions but might give many of us much food for thought, and that has to be a good thing.
It would not be proof of the application in all conditions but might give many of us much food for thought, and that has to be a good thing.