We have a red oak (we've been told it is a pin oak but doubt this) that we dug out of the woods when it was about 1 foot tall. That was about 15 years ago. We transplanted the oak when it was about 4 feet tall as we moved. It is now about 15+ feet tall and seems healthy. About 2 years ago we place a 6' dowel rod to the top of the tree to straighten the top as the top was limp. It seemed to be doing well, so we removed the dowel rod this year and within one week ithe entire tree had folded itself down so that it leans perpendicular to the earth. The soil is sand but other red oaks grow fine.
Any suggestions? --Sherburne County Minnesota