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Plant invasiveness is determined by evaluating a plant’s biological and ecological characteristics against criteria that encompass establishment requirements, growth rate and competitive ability, methods of reproduction, and dispersal mechanisms.
|Each characteristic, or criterion, is assessed against a list of intensity ratings. Depending upon information found, a rating of Low, Medium Low, Medium High or High is assigned to that criterion. Where no data is available to answer a criterion, a rating of medium (M) is applied. A description of the invasiveness criteria and intensity ratings used in this process can be viewed here.|
|Germination requirements?||Seeds germinate in autumn.|
|Establishment requirements?||Can establish under moderate canopy → occurs under trees in scrubby paddocks & along shady creek banks.|
McKenzie et al (1988)
|How much disturbance is required?||Establishes mostly in highly disturbed natural ecosystems e.g. roadsides, suburban allotments, paddocks, fence lines etc.|
McKenzie et al (1988)
|Life form?||Erect shrub → ‘other’.|
|Allelopathic properties?||None described.|
|Tolerates herb pressure?||Cattle graze C. Parqui only after the more palatable species have been depleted.|
Orguin et al (1982)
|Normal growth rate?||Grows well on alluvial river flats often to the exclusion of most other vegetation.|
|Stress tolerance to frost, drought, w/logg, sal. etc?||Frost hardy, occurs in arid areas of South America, perhaps also waterlogging (occurs along creek banks & high rainfall gullies).|
|Reproductive system||Reproducing from creeping roots & by seed.|
|Number of propagules produced?||>2,000 assumed due to producing abundant berries containing seeds.|
|Propagule longevity?||Seeds remain dormant in the soil for many years.|
|Reproductive period?||Plants are ling-lived.|
|Time to reproductive maturity?||Plants are at least 2 years old before flowering.|
|Number of mechanisms?||Birds, water, pieces of root dragged by cultivation equipment.|
|How far do they disperse?|
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