The more common Typha orientalis (bulrush) is an introduced species (from eastern and northern Australia) and is taking over from naturally occurring plants. Typha was removed from this area near the boardwalk (foreground). Not all the plants are removed at once (background) because water birds use the shelter for nesting, roosting and habitat .
Eradication is difficult due to high seed production and rhizomatous root systems.  On the opposite side of the lake Typha is slashed and a targeted herbicide applied (glyphosate registered for aquatic situations*).
The red marking dye shows where herbicide was applied (only to individual slashed stalks to be absorbed through the leaves and kill the root system). Baumea articulata plants (left) were avoided. The lone Typha shoot (centre) grew since herbicide application from the soil seed bank or the extensive root system. This is why treatment needs to be repeated annually. 
Endemic sedges are planted where Typha previously grew. Two years ago Baumea articulata was planted along this fence line.
Baumea articulata soon after planting in April 2014.
This area is flooded by winter rains and the plants stand in water in the latter part of the year. The opposite side of the inundated fence line in December 2014.
Perth’s harsh climate means many plants die in revegetation projects. Few plants made it to maturity, but the ones that did are growing well and flowered over summer.
spent Baumea articulata flower from last year
In the last few weeks the fence line has been moved to protect these paperbarks (Melaleuca rhaphiophylla) and another planting of sedges.
The fencing continues along the open section which floods in winter, to protect the new plants.
Newly planted sedges are currently far from the water. This area will be waterlogged throughout winter and spring as the waters rise.
Looking back towards the older planting across the newly planted sedges.
The same view a month ago before the fence line was moved, March 2016.
*Some preparations of glyphosate are harmful to fish and other aquatic life, due to the surfactant.  Roundup Bioactive is registered for use near water because it does not contain that surfactant. 
- Brown & Bettink (2015) Typha orientalis: Management Notes (for the Swan NRM Region) Perth, WA: Florabase.
- Moore & Wheeler (2008) Southern Weeds and their Control (2nd ed.) Perth, WA: Dept. of Agriculture.
- Scotts Australia (2012) Defender Glyphosate 360 Weed Control MSDS No. 190400.
- Brown & Brooks (2002) Bushland Weeds: A Practical Guide to their Management Perth, WA: Environmental Weeds Action Network.