Ivy-leafed Sida (Malvella leprosa) (Nox)
Ivy-leaf sida, alkali sida
Malvella leprosa (Ort.) Krapov.
Ivy-leaf sida is declared under the Catchment and Land Protection Act (1994) as a State prohibited weed. State prohibited weeds either do not occur in Victoria, or are present and can reasonably be expected to be eradicated. State prohibited weeds are the highest category of noxious weeds under the Catchment and Land Protection Act (1994). The Department of Environment and Primary Industries is responsible for the eradication of State prohibited weeds. The Victorian Government is committed to preventing the introduction of high-risk weeds into Victoria, to protect our environment and economy.
Ivy-leaf sida is native to western North America and has not established in any other country other than Australia.
A deep-rooted perennial herb up to 30 cm high with both
erect and prostrate stems. Stems- to about 40 cm long, branched, light green, covered with star-shaped hairs.
Leaves - 2.5 to 3.5 cm across, sometimes larger; fan- shaped with bluntly toothed margins; on short stalks; covered with star-shaped hairs wich make the plant appear grey-green; veins are prominent underneath the leaves.
Flowers - 2.5 to 3.5 cm across, yellow or cream, 5 petals; at the ends of branches on short stalks between leaf stalks and main stems and in loose clusters at the ends of branches.
Ivy-leaf sida reproduces from both seed and buds on the creeping root system. Seed germination and bud growth occur in spring. Topgrowth, produced in spring each year, grows rapidly to produce flowers in summer and dies off in autumn. New shoots emerge from the root system the following spring.
Use a product containing the following combination of active constituents that is registered for use in Victoria to control ivy-leaf sida in the particular situation in which you need to use chemical control, eg. in pastures. Consult the product label for detailed information.
Ivy-leaf sida seeds may contaminate agricultural or earth-moving equipment and animal hides. Cultivation distributes root fragments which may grow to create a new infestation or spread an existing one.
Ivy-leaf sida is not readily grazed by animals and can compete strongly with pastures, particularly in alkaline soils. The known distribution of ivy-leaf sida in Victoria is in the Pyramid Hill - Cohuna area. It is associated with irrigation channels and irrigated pastures.
What should you do if you find an nodding thistle plant?
If you think you have purchased or seen an alligator weed plant, please contact the Department of Environment and Primary Industries by telephoning 136 186 or use the online reporting tool
Please do not attempt to control or dispose of this weed yourself.
Parsons, W.T. (1973). Noxious Weeds of Victoria.
Melbourne, Inkata Press. Parsons, W.T. and Cuthbertson, E.G. (1992) Noxious Weeds of Australia. Melbourne, Inkata Press.