The U of M extension office has created a new website called Myminnesotawoods.org
It’s got some good info on the natural history of savannas, woodlands, and forests in Minnesota as well as specific information about tree growth and forest health. It encourages forest stewardship for a variety of purposes, including renewable timber harvest, recreation, and restoration.
Lots of good info worth checking out. Maybe some of our knowledgeable MN Native Plant Society members can lend their advice at the Message Boards!