Originally Posted by Patriot Services
The most damge to trees from trimmers is girdling. Either wrap the base, install a mulch ring or learn a little trimmer discipline. Throttle back and easily pull the grass away. If the bark is more than 50% gone around the base the will die. Gly and pre ems are usually not a good idea and damage the tree as well. I personally prefer selling ring beds which add value and interest to the landscape.
Posted via Mobile Device
I agree with this. The trees never were installed with proper landscaping. If you have a base of a tree exposed like that there will always be little cuts no matter how hard you try. Should have had a mulch, stone, or something around the base. I highly doubt the trimming caused the trees to die.