A fast-growing weed known as Spanish moss is smothering native trees across Willoughby, sparking a public campaign to protect the region’s unique bushland and biodiversity.
The call for public involvement comes after a noticeable increase in infestations of the plant, which is also commonly known as Old Man’s Beard. This month, local officials passed a resolution to take proactive steps to contain the weed, with a public education campaign scheduled to launch in the coming months to support the effort.
An Escalating Environmental Threat
Though it is not currently listed as a prohibited plant under New South Wales biosecurity laws, Spanish moss (Tillandsia usneoides) is officially recognised as a weed by the Department of Primary Industries. The plant poses a serious problem by smothering the branches of its host, blocking essential sunlight and preventing photosynthesis. The sheer weight of a heavy infestation can also stress limbs, causing them to break and damage the tree.
This invasion alters the natural habitat, affecting native species and the delicate balance between predators and their prey. Officials have noted that warmer and wetter climate conditions are helping the weed to spread even faster, making containment a difficult and costly challenge, especially when it reaches high into the tree canopy.
Mayor Tanya Taylor stated that Spanish moss is becoming a significant environmental threat in the area’s urban forest. She emphasised that early action and strong community cooperation are essential to protect the health of the local tree canopy and biodiversity.
Council Outlines Proactive Strategy
To manage the problem, Willoughby’s city council is implementing a multi-faceted plan. The strategy includes the removal of infestations from trees on public land and reserves. Management and monitoring of the weed will also be integrated into existing bushland and reserve action plans.
Additionally, training will be provided to bushcare volunteers and staff to help with early detection and rapid response. To support the community, updated fact sheets and communication materials will be distributed. Local authorities are also advocating for the state to review the official classification of Spanish moss to give communities more power to control it.
How Residents Can Protect Local Trees
The success of the campaign relies heavily on residents taking action on their own properties. The weed particularly affects important native canopy trees like turpentines, brush box, lilly pilly, and cheese trees, along with popular ornamental species such as maples and bottlebrush. Spreading easily by wind, birds, and even human activity, it can quickly colonise new areas, including private backyards and apartment balconies.
Residents are being asked to check their trees and gardens for any signs of Spanish moss and to remove it wherever it is safe to do so. Officials strongly advise against using the plant for garden decoration or landscaping, as this practice directly contributes to its spread throughout the community. Information to help residents identify and responsibly manage the plant will be shared through social media, newsletters, and the local government website.
Published Date 24-July-2025
