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Balloon Vine environmental weed Environmental weeds are plants that invade our natural bushland, displace native plants and reduce biodiversity. Environmental weeds can have similar negative impacts to those described for noxious weeds. Although they are not listed as declared noxious, Council invests significant resources in controlling these weeds to protect the City’s precious natural environment, to support community well-being, and our tourism economy. Scientific name Cardiospermum grandiflorum (Family: Sapindaceae) Fact Sheet Description Habit: Herbaceous climber with stems to more than 10 m long. Leaves: Leaves 6 cm to 16 cm long, on a leaf stalk 2 cm to10 cm long, with three leaflets each further divided into three. The margins of leaflets are irregularly toothed. Flowers: Flowering most of the year. Four white petals in clusters. The stalk of the flower head ends in a pair of tendrils. Fruit: Three-seeded in a papery-white, enclosed lantern with three sides. The lantern is green and as it dries out becomes papery. Photo Source: P. Chrismas. Blue Mountains City Council - Bushland Operations Team | www.bmcc.nsw.gov/sustainableliving/weedmanagement | Phone: 4780 5000 zb2466env-Balloonvine_bmc.indd 1 15/12/2015 5:20 pm Balloon Vine environmental weed Alert The native vine Slender Grape (Cayratia clematidea) looks very similar. Both plants have leaves with leaflets and toothed margins. The native has five leaflets and is not hairy. The weed has nine leaflets and is hairy. The native has green flowers with bunches of black berries. The weed has creamy flowers with seeds in papery capsules. Dispersal Spread by seeds transported by wind and water. The papery seed pods form little ‘boats’ that travel easily down waterways. Seedlings germinate most of the year on disturbed land. Impacts Plants spread over ground, or climb trees and shrubs, eventually shading out all light and killing the host plant. Current distribution Lower Mountains including the escarpment, but also at Blaxland, the edge of Warrimoo and Springwood. (Also the Nepean River) Control • Juvenile and mature plants can be scraped and painted with herbicide. Scrape each stem as far as possible. If the vine has grown up into the canopy of a tree or shrub, it is good to cut each of the vine stems to allow the parts in the tree canopy to die. (Cut each stem about 50 cm above the ground, but first ensure that you have scraped and painted above and below the planned cut.) It is important to keep the cut low to allow adequate length of the stems to be reached for re-treatment. • Old vines with very large stems can be stem injected, or cut and painted. Repeated applications will be required. • Spray with a selective herbicide if there are no native plants nearby. A selective herbicide reduces impact on nearby native grasses. • Cut out of the tree canopy. *Avoid damage to native vegetation by not pulling vines from trees. Dead vines can also be habitat for microbats and other small animals. It is best to treat plants before they produce masses of seed. Once they have seeded it is almost impossible to collect all the seed. However if you can collect the seed, treat them in a hot compost system (to kill the seeds). Plan follow-up treatment to deal with the new seedlings. Fact Sheet Cut and Paint Stem Inject Scrape Plant this instead Water Vine (Cissus Antarctica), Wonga Wonga Vine (Pandorea pandorana), Hardenbergia spp., Kennedia spp. or Native Clematis . NOTE: Be aware that cultivated Clematis can be an environmental weed. For example, Clematis montana has been found aggressively invading some bushland reserves in the Upper Mountains. Control illustrations by Virginia Bear. For more information on weed identification, control methods, herbicide use and weed contractors see: Blue Mountains City Council - Weed Management Team | www.bmcc.nsw.gov/sustainableliving/weedmanagement | Phone: 4780 5000 zb2466env-Balloonvine_bmc.indd 2 15/12/2015 5:20 pm