TreeDimensional

TreeSpecialist, statistically what are your observations on WHO is responsible for planting new trees too deep? I would bet that (in order of occurrence) homeowners, landscape contractors, and finally in-experienced arborists are to blame.

Have you see any correlation between size of tree at planting to incidence of sucker development?

We don't see this issue here much, as the trees that do well here are hardy for a 2b climate. The other issue here is the fact that we have a heavy clay soil, and frequently find that roots are very close to (or Above) grade. This of course could be explained by the nature of the soil (compaction), and the relationship of the root/oxygen requirements.

Another issue that you bring up is the task, and salesmanship of root flare excavation. As you stated Oaks don't like their feet too wet, this would indicate to me the importance of educating the tree owner that they are planting a tree and NOT transplanting a carrot. The issue here is that leaving a depression at the base of the tree might be counter-productive, and the best overall approach is to change the grade of the yard to allow for proper drainage. I am always frustrated when I have to come in and weigh the options for the client. Fortunately, I have developed an approach of informing the client of ALL options, and suggesting that they don't spend good money on BAD projects.

Sorry for the long winded stuff, the point is, do it right the first time, and IF you don't know what your doing, seek people who are experienced in this field. A caveat to this of course is that with the Internet, EVERYONE is an expert!