Bridal creeper (Asparagus asparagoides) is regarded as a significant environmental weed in Victoria, South Australia, Tasmania and Western Australia, as a relatively important environmental weed in New South Wales, and as a potential environmental weed in south-eastern Queensland. It is undoubtably one of Australia's most important environmental weeds and is a Weed of National Significance (WoNS).It is regarded as one of the worst weeds in Australia because of its invasiveness and environmental impacts. Bridal creeper (Asparagus asparagoides) is a major weed of bushland in southern Australia, where its climbing stems and foliage smother native plants and can completely dominate the lower layers of the vegetation. It also forms a dense layer of underground tubers which impedes the root growth of other plants, reduces the soil moisture available to other plants, and prevents seedling establishment. Bridal creeper (Asparagus asparagoides) invades undisturbed bushland habitats and is a major threat to low shrubs and groundcover plants in mallee, dry sclerophyll forest, coastal and heath vegetation. In South Australia and south-western Western Australia bridal creeper is considered to be the most important weed threat to biodiversity and it is actively managed by community groups in these and other regions. In New South Wales it is most common close to the coast, where it invades banksia woodlands and other open coastal vegetation. Numerous rare and endangered native plants are threatened with extinction by this weed, especially where it has invaded conservation areas. In South Australia it has been identified as a threat to several endangered species, including the pale leek-orchid (Prasophyllum pallidum) in Belair National Park, the west coast mint-bush (Prostanthera calycina) in Calpatanna Waterhole Conservation Park, the sandhill greenhood orchid (Pterostylis arenicola) and the metallic sun-orchid (Thelymitra epipactoides) in Coorong National Park, the blue range emubush (Eremophila barbata) in Hincks Conservation Park, and the ironstone mulla mulla (Ptilotus beckerianus) in Wanilla Conservation Park. It is also thought to be a potential threat to the endangered neat wattle (Acacia rhetinocarpa) on the Yorke Peninsula in South Australia, and the endangered Kangaroo Island pomaderris (Pomaderris halmaturina) on Kangaoo Island. Bridal creeper (Asparagus asparagoides) also smothers existing plants and prevents the regeneration of seedlings of the threatened jumping-Jack wattle (Acacia enterocarpa) in south-eastern South Australia and western Victoria.In the Coffs Harbour regions in northern New South Wales, the endangered native grass Alexfloydia repens is threatened by several weeds, including bridal creeper (Asparagus asparagoides). This grass is also the sole food plant for the endangered black grass-dart butterfly (Ocybadistes knightorum). So by replacing this butterfly's larval food plant, limiting its regeneration and reducing open space in the overstorey in which adults fly, bridal creeper (Asparagus asparagoides) and other weed species are threatening the survival of two endangered native species in this area. It is also one of the major environmental weeds that are invading the habitat of the endangered rice flower, Pimelea spicata, in the Sydney region in New South Wales.