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Guy, to a 64 year old, 17 years is dang near newborn. Thanks for the newer info.

In answer to your question about root and stem grafts, here is a quote from an article from The Ohio State University. "Certain trees are more prone to this problem than others. Lindens, magnolias, pines, and maples other than the silver maple are susceptible to root girdling. On the other...

The girdling root issue with deep planting has to do, as I understand it, with the roots being able to grow up over the top of the major spreading roots if there is soil or mulch available for them to grow into. If the major roots, at least those in that region of rapid taper close to the...

The main thing on adding soil is that it reduces oxygen to the root, the gaseous exchange that was mentioned. In low oxygen situations, respiration is reduced. Respiration is required for the plant to take in water and the accompanying nutrients. This is the phenomenon that leads to what we...