quote:
Why would a container grown tree go through so much shock if properly cared for after installation?
It's all about the root growth. Even if a container grown tree has been properly cared for, it's root system is notably smaller than it would have been if already in the ground and it taked larger trees longer to re-establish a critical root zone before moving on to canopy growth. Two bur oaks I planted in my front yard are starting to make me believe this theory. One was a 50-gallon tree, probably 2.5-3" inches diameter at base, the other was a barely 1" wally-world special I paid $8 for.
The wally-world special has developed a more well rounded canopy and is almost 3" diameter at base, while the larger tree has added about an inch of diameter, but still has a weak canopy, and for some reason the leaves have always been a bit undersize. It put out three acorns the first year, about 50 last year, and only about a dozen this year.
This June will mark 4 years those trees have been in the ground, they were planted the same day.
As far as the cross sections I saw, it was at a tree care class in College Station, taught by Dr. Todd Watson, and he had pictures in his presentation.