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In our environment, weeds are usually plants from overseas or from some other areas of Australia that have been able to naturalise here and to invade bushland and gardens. Specific weeds the Landcare Group have been historically fighting are largely garden escapees:

The worst include pine trees that change an environment as they grow faster and taller than local trees and inhibit the regeneration of local indigenous species. Sugar Gums that hybridise and out- compete local eucalypts and Basket willow which spreads and chokes waterways.

Middle storey weeds include Pittosporum odoratum, Cotoneaster, Prunus, Cootamundra wattle, Acacia longifolia, Acacia decurrens and Polygala.

Problem climbers are tenacious and pernicious. They include English ivy, Cape ivy, Bridal creeper, Blackberry and Honeysuckle, all plants which swamp areas and cause the death of local plants. Periwinkle and Tradescantia form dense ground cover, out competing everything.

Smaller shrubs and plants include ALL Broom species, including hybrid plants sold through nurseries; Spanish Heath, Boneseed, all Thistles, Watsonia, and Agapanthus. Angled onion and varieties of Oxalis species, particularly Soursobs, are also a huge problem.

Some of our worst weeds are grasses. Erhartas (annual nd perennial), Sweet vernal, Yorkshire fog and Brown-top bent can invade widely. The Briza species, especially Shell grass, have become an annual plague.

You can avoid weed problems by removing anything you see that is starting to behave like a weed.

Weeds we don't need


A weed is a plant ' out of place' or 'growing where it is not wanted'.
A prized garden plant that escapes into natural bushland, may pose a threat to the native flora and fauna and therefore becomes a weed. An example is the Agapanthus praecox.

Introduced into Australia from South Africa where it is relatively rare it can flourishes if unchecked.  It produces a beautiful blue, purple or white floral display in summer when most other plants are struggling and needs little water which makes it prized as a 'low maintenance' plant. The leaves, rhizomes, and sticky sap are poisonous and a skin irritant so should be treated with care. 

If you want to have them, RETAIN WITHIN YOUR GARDEN by removing the flower heads before they go to seed and carefully disposing of any roots that
may reproduce if thrown away. 

agapanthus weed plant

agapanthus weed plant

Download a list of weeds that grow in the peninsula