Plea to Aussies as common garden plant explodes in major city: 'Becoming a problem'

Yahoo

18-06-2025

Aussies have been urged to inspect their own backyards as an escaped garden plant continues to wreak havoc in a major city. Spanish Moss, a hanging plant that thrives in warm, humid environments, is exploding in Sydney after months of heavy rainfall, prompting a warning to residents from local councils and landcare groups.
The ornamental, which is native to tropical and subtropical America, is a common addition for those with a green thumb, but there are concerns gardeners are unaware of just how quickly it can spread and overwhelm larger trees.
'Bush regenerators are raising the alarm as Spanish moss spreads more widely,' Dr Carol Booth, the Invasive Species Council's policy director, told Yahoo News.
'It's an epiphyte — a plant that grows on other plants — and it can infest dozens of native tree species. We've seen turpentines, brush boxes, lilly pillies and cheese trees all severely impacted. It can grow thickly, smothering trees, blocking sunlight, breaking branches and sometimes killing the host by preventing photosynthesis.'
Recently, Willoughby City Council in the city's lower north shore urged residents to keep an eye out for the plant, noting it is 'becoming a problem'. 'Please remove it if you can, don't purchase or share the plant. Help protect our trees!' it said online.
Nearby Lane Cove Council has issued a similar warning stating Spanish Moss 'is becoming increasingly common in the Sydney region' and 'threatens the local critically endangered Sydney Turpentine-Ironbark Forest and Blue Gum High Forest communities'.
'If you have Spanish Moss growing in your garden, it is recommended that you remove it and dispose of it in your green waste,' the council said.
The plant is increasingly being recognised as an environmental weed — particularly in the Sydney region — but it's not currently declared under any laws, Dr Booth said. It has established in the wild in parts of Queensland and NSW, including the Lismore area and Lord Howe Island.
'It spreads readily through fluffy wind-borne seeds or fragments carried by birds, wind or human movement. That makes it particularly hard to contain once it's in the landscape,' Dr Booth told Yahoo. 'Despite the risks, it remains a popular ornamental plant that can be legally sold across the country.'
And it's far from the only one, with experts sounding the alarm over another nasty weed — gazania — earlier this month. Despite the South African native flower emerging as a serious invasive threat to native grasslands and grain-growing regions, it's still being sold at nurseries.
Escaped garden plants are the primary source of new weeds in Australia, with a whopping three-quarters of all environmental weeds starting out as ornamentals. This has prompted the Invasive Species Council to campaign for stricter regulations on the nursery industry to stop the selling and spreading of such plants, which contribute to over $5 billion in losses each year.
'More than 30,000 plant species have been imported into Australia for gardening, but fewer than a quarter have been assessed nationally for their weed risk,' Dr Booth said. 'Some of our worst invasives — like lantana and blackberry — were once common garden plants.
'Unless governments act, we'll keep selling the next potentially disastrous plant, putting our bushland and protected areas at risk.'
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Anyone who finds Spanish moss in their garden is encouraged to remove it, even if they don't live near bushland.
'It can be removed by hand, though this can be difficult on tall trees,' Dr Booth said. 'Herbicides may also work, but there's a risk they could harm the tree it's growing on — so mechanical removal is the safer option where possible.'
Residents who are unable to extract the plant themselves can contact their local council for advice.
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