Climbing spindleberry looks attractive but Horizons Regional Council says it's a pest and people should report it.
The council says it's problematic in all gardens.
Horizons plant biosecurity officer Jack Keast says climbing spindleberry is a threat to New Zealand's native trees and pine plantations.
"It climbs its way up to the top of forests and bush to get to the canopy, preventing the trunk it is growing around from getting any wider.
"It gets so dense and heavy that it collapses the trees under it.