Ludwigia peruviana is vigorously opportunistic, clogging waterways and dominating other water and creek bank vegetation (The Sydney Weeds Committees, Undated).
Location Specific Impacts:
Human nuisance: Johnson and Smith (2004) observe that L. peruviana a plant of wet places, has the potential to become more widespread and difficult to control once established.
Burnt Bridge Creek (Australia)
Modification of hydrology: Aquatic weeds such as the L. peruviana, which has been previously recorded in Burnt Bridge Creek, are known to restrict the flow of water in creeks. This may be why flow before the dam (where the most amount of weeds were recorded) was less than that downstream (Sadler and Dempsey, 2002).
Warriewood Wetlands (Australia)
Habitat alteration: L. peruviana apperars to have taken over the open water area in the Warriewood Wetlands and to be colonising into the adjoining forest (Warriewood Wetlands, 2003).