I got TreeKeeper training from professional arborists. One of the lessons I learned was that trimming more than 1/3 of potential foliage from a tree in a single growing puts stress on the tree, causing abnormal growth patterns as the tree struggles to make up for the energy-generating capacity that was lost. Some of these trees had as much as 1/2 to 2/3 of their potential foliage removed in a single day, creating extreme stress and making them more vulnerable to disease. The growth that was removed will never return in any sort of natural, healthy form. The trees will grow new branches, but they will never look normal again.
The mutilated trees shown above were much fuller before, more like the trees in the picture below.
The trees shown below (near the corner of the parking lot) were mutilated last year, presumably by the same person.
They should look more like this:
... and not like the trees below, also mutilated last year, next to one of the baseball fields.
To whoever is doing this, please STOP NOW!!! Don't cut ANY more trees in this park or any other park.
These trees belong to all of us. Your actions have damaged the health of many formerly beautiful little trees and deprived us all of their former beauty. Please leave the pruning work to those who have proper training.
If you see someone cutting trees who is not a park district employee or TreeKeeper volunteer, please report them to park district staff or the police before they can do any more damage.