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Environmental weed invasion has been identified as one of the major threats to biodiversity conservation across Western Australia and on a national scale. Weeds compete with native plants for space, water and nutrients and can alter the vegetation in our bushland reserves. The City of Cockburn encourages all residents to help control weeds on their properties. This educational brochure provides you with basic information on recognising problem weeds within the City and methods of their control. For more information please contact the City’s Environmental Services team.
Weeds are plants that grow in sites (not necessarily non-native) where they are not wanted and have detectable environmental or economic impacts. Many garden plants have the potential to ‘escape’ and become environmental weeds in local bushland. Some weeds are listed as Declared Plants (DP) and Weeds of National Significance (WoNS) under state legislation and therefore there’s a legal requirement to manage them.
Weeds compete with native plants for space, water and nutrients and can alter the vegetation in our bushland reserves. Weeds can also increase the frequency and intensity of bushland fires. Weeds are a major threat to Australia’s biodiversity by reducing habitat and available food sources for native fauna.
To reduce the spread of weeds follow these steps on your property:
See our ‘grow local plants’ brochures for ideas on suitable native species.
Forms dense thickets. The prickly stems take root where they touch the ground. Provides food and shelter for rabbits and foxes. *Control: CH Declared pest
Poisonous to people and animals. Renewed annually from corms. Can form large clumps. Spreads from seed and tubers. *Control: CH Declared pest
Poisonous to mammals. May cause skin irritation. Can produce many seeds. *Control: CH – when most seed has germinated Declared pest
Rapid mat-forming annual. One plant can produce up to 20,000 seeds and up to 1,000 fruit. The fruit is covered in sharp and rigid spines. Punctures bicycle tires and penetrates animal paws. *Control: CH Declared pest
Noxious weed. Forms dense thickets. Poisonous and irritating milky sap when cut. *Control: MA, CH
Fast growing. Each plant has an average of 100 seeds. Can increase fire fuels. *Control: MA, CH
Very fast growing. Seeds are poisonous to humans and stock. Spreads by seed. *Control: CH
Serious weed. Supresses other plants germination. Sets large amounts of seed. Usually dies during summer months. Significant fire hazard. *Control: CH – when actively growing
Toxic Reproduces by seed and suckers. Interferes with growth of surrounding plants. *Control: CH
Annual renewed corm. Spreads by seed and corm. Dominant weed in native bushlands. *Control: CH – just on flowering for corm exhaustion
Grows rapidly in different soil types and conditions. Reproduces prolifically by seed. *Control: MA, ME, CH
Can be difficult to control. Reproduces by seed. Seed vialble for 20 years. *Control: CH, MA – when young
Department of Primary Industries and Regional Development
FloraBase