Alan Britland, of the Wakatipu Wilding Conifer Control Group, is calling for as many volunteers as possible to help remove the "out of control" plants in a two-day clearing operation on November 20 and 21.
The clearing is vital to ensure the survival of native plants in the Ben Lomond area, he said.
A similar operation took place last November and in March this year.
"The wild conifers are just taking over ... It's something which needs to be kept on top of, and we are making a difference."
Mr Britland said he noticed recently the non-native plant had started to spread into new forestry areas, which would pose further threat to existing indigenous species.
The operation is expected to take two full days to complete and Mr Britland said he hoped to gather about 40 volunteers for each full day's work.
"The work isn't terribly hard but it does cover some rough terrain so we need people with a reasonable level of fitness," he said.
The operation begins at 9.30am on both days at the base of the Skyline Gondola.
New clearing tools have been provided using a $2000 grant from the Community Southland Trust.
• Mr Britland can be contacted at britland.alan@gmail.com or 027 441-4416.
