The European lime and the Turkish oak are in the Park Gardens in Slad Road, Stroud.
In July 2007 the area was badly flooded and damaged the roots of the trees. Now they are fighting disease and in danger of dying if something is not done.
Jim Mathison, Green Spaces manager for Stroud Town Council, says the trees will be cut back – or pollarded – in the hopes of giving them a chance to survive.
“By cutting them back we hope to encourage new growth and give the trees a fighting chance to recover. It also is important for public safety that these trees are cut back,” he said.
Work on the pair, which are between 30 and 50 years old, will begin in the next month.
The town council is also planting two new trees. “We hope these great trees will survive and we would not want to lose them but we will also plant two new ones to make sure we maintain the wonderful tree cover in the park,” said Mr Mathison.