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Description: A free floating aquatic herb with glossy, spoon shaped leaves and distinctive purple/lilac
flowers. Water hyacinth forms dense blankets over waterways and wetlands.
Distribution: A major weed of all river systems and connected wetlands in the lower Herbert. The
heaviest infestations are in the Cattle, Palm and Trebonne Creek systems.
Impacts: An aquatic weed that can choke waterways. It floats on still or slow-moving water and can
grow rapidly to cover the entire water surface with a thick mat of vegetation. This shades out any
submerged plant life and impedes oxygen exchange, making the water unsuitable for fish and
other animals. Salvinia infestations reduce the natural beauty and biodiversity of wetlands.
Key projects: Long term management projects are taking place in the Upper Cattle Creek, Palm
Creek and TYTO Wetlands reserve .
Prevention
Implement a community education and awareness program to prevent water
hyacinth’s spread to clean catchments. Ensure water features and
ornamental gardens do not contain water hyacinth.
Many areas to the north of Hinchinbrook do not have water hyacinth, it is
an offence under the Biosecurity Act 2014 to sell, give away or release this
plant into the environment.
Intensive control
Limited resources are available to expand current scope of control programs
underway in the Palm, Cattle and Ripple Creek catchments. A biocontrol
agent ( a weevil) does exist, but seems to be ineffective in the lower Herbert
Impact
reduction
Continue to release and distribute biocontrol agents. Reduce cover in dense
infestation. Manage alongside other aquatic weeds (Salvinia and
Hymenachne).
Restoration of riparian vegetation may assist in shading out or reducing the
density of Water hyacinth infestations.Water hyacinth forms dense rafts which have the potential to cause
significant damage to infrastructure during flood events.
flower x x x t t p p p p t x x
seed x x x t t p p p p p t t
spray p p p p t t t t p p p p
mechanical p p p p t t p y y y y y
biocontrol p p p t t t t t t p p p
J F M A M J J A S O N D
Eichhorinia crassipes (Water hyacinth) P
rio
rity
D
eta
ils
Biology x
Peak t
First/last flush p
Occasional y
n/a
Control x
Optimal t
Good p
Marginal y
Not recommended
C
on
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ale
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ar
Ma
na
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me
nt
req
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em
en
ts 1 2 3 4 5
Restricted matter category
6
2.5/5 1.5 4.0/5 4.2/5 4.8/5 2.2/5 2.0/5 1.4/5 1.4/5
51
Hin
ch
inb
roo
k L
oca
l G
ove
rnm
en
t A
rea
Bio
se
cu
rity
P
lan
a
qu
atic
flo
atin
g
pe
ren
nia
l Eichhorinia crassipes (Water hyacinth)
Control
Spread
What is my biosecurity obligation?
Prevention zone
Ensure any machinery or vehicles moving from the infested areas
are free from plant material and soil.
Intensive control
zone
Manage infestations systematically from top of catchment down.
Ensure best practice weed hygiene measures are in place to reduce
risk of spread to new locations. Maintain weed free areas
Asset protection
zone
Ensure best practice weed hygiene measures are in place to reduce
risk of spread to new locations. Maintain weed free areas. Identify
high value assets and protect them from impacts where possible.
For more information on management aims in each zone refer to Using the Biosecurity Plan templates
Restricted matter category
52