About 30 volunteers are needed to help cut back undergrowth in Lime Tree Avenue during a task day on Saturday, February 16.
Two task days are held each year to prune back shoots growing from the base of Lime Trees.
The last was held in October and Dr Martyn Stenning, chairman of Lime Aid, the organisation set up to look after the 100 trees, is appealing for more people to come forward to join the next work party.
Dr Stenning said: “If we could get about 30 people to come along then we could really make a difference to the health of lime trees and the appearance of this historic avenue.”
The task day will run in the avenue from 10am-4pm and helpers are free to do as little or as much as they like during this time and to come and go as time permits.