Japanese sunflower (Tithonia diversifolia) is continuing to spread throughout the Coffs Harbour region and is now well established in many parts of the LGA. Increasingly common along roadsides, creek lines, vacant land, forest edges and other disturbed areas, this invasive weed can quickly dominate a site and is becoming a growing concern for bushland, riparian areas and biodiversity across the region.
North Coast landholders and Landcare volunteers are encouraged to keep an eye out for Japanese sunflower as it begins to flower across the region. This environmental weed is easily recognised in the spring by its large, bright yellow, sunflower-like blooms, making infestations easier to identify.
Once established, Japanese sunflower can rapidly form dense thickets that smother native vegetation, restrict natural regeneration and reduce habitat values. Early detection and control are critical, as a single plant can produce more than 120,000 seeds, which are spread by wind, water, animals, contaminated fodder and human activity.
the Japanese Sunflowers have up to 15 yellow petals and yellow centres
Japanese sunflower can also spread from stem fragments, making the dumping of garden waste a significant risk. Even small pieces of the plant can take root and establish new infestations, particularly in moist environments such as creek banks and drainage lines.
Landholders are encouraged to inspect their properties and manage infestations before they spread further. Landcare volunteers should also be mindful of Japanese sunflower encroaching into Landcare sites.
Acting early can significantly reduce the cost and effort of future management.
For more information on identifying and controlling Japanese sunflower, visit the NSW WeedWise website or stop by our office for a free copy of Weeds of the North Coast of NSW – A Guide to Identification and Control.
