Tree Disease was the topic of Master Gardener class. Our instructor made a comment that trees don't heal but rather compartmentalize. Like a submarine. This has fascinating me. Realize that I work with children and families some of who have been terribly traumatized and are compartmentalized.
Anyway... Trees are amazing! Growing up on a ranch in western South Dakota where tree groves and stands were critical to surviving those winter blizzards! Weeding. Watering by buckets. This wasn't fun. But influential.
Experts: Learn about trees:
To be clear, trees do not heal. While this might sound false, it is true that trees do not regenerate growth from old cuts and wounds. What trees actually do is compartmentalize the decay or wound and grow around it. Dr. Alex Shigo, a legendary tree scientist, coined the phrase CODIT to explain how trees respond to wounds and injuries (including cut limbs). CODIT is the Compartmentalization Of Decay In Trees. Once a cut is made or a tree is injured, yearly annual growth will begin on the perimeter of the cut. This growth is from tissue on the tree that hasn't been injured. This can be readily observed on trees in any landscape, and it is what creates the "cat eye" look of old cuts on trees. Years after normal tree care, in which the cuts were made properly, you can observe that the cuts have been closed or are beginning to close by annual growth. This doesn't, however, mean the tree healed that cut, but rather it simply grew around it and moved on. Trees have an amazing ability to compartmentalize injuries, diseased limbs, and cut limbs.
http://www.weknowtrees.com/how-do-trees-heal.html
Trees for Western Nebraska
http://youtu.be/QV9_86AZNC8
Nebraska Statewide Arboretum
http://arboretum.unl.edu/greatplants/
http://nfs.unl.edu/retreenebraska.asp
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