Description: A shrubby or sprawling annual that has four angled branches with a line of sharp, hooked prickles along the angles. Unlike commons sensitive weed, giant sensitive Plant (GSP) grows as a small to large shrub. Distribution: Widespread distribution within the Hinchinbrook Shire, often associated with road and rail transport, areas of disturbance or fallow and unused land. Impacts: GSP will choke up cane, other crops and grasslands causing loss of crop and pasture production. The seed of GSP can remain viable for many years even decades so any measures to prevent spread and establishment in new areas is worthwhile. Key projects: A joint project between HSC, HCPSL and Terrain will be conducted in April/May Prevention Prevent the establishment of GSP in new areas through an industry led, catchment wide management program. Ensuring best management practice hygiene measures are in place when moving to clean areas or between properties will reduce the opportunities for spread. Asset protection Giant Sensitive Plant is problematic for sugar production and grazing . Annual surveys of known infestations will assist to determine locations which are free from this weed. A psyllid biocontrol agent is present in the wet Tropics which can be effective at reducing seed production. The effectiveness of the psyllid and its distribution in the lower Herbert are not well known. Although GSP is widespread across the lower Hebert, infestations usually occur as localised outbreaks which can be managed annually though routine management. Careful management of cane transport infrastructure such as hard stand and rail areas will assist reduce spread. The ongoing implementation of hygiene measures for roadside management operators and within the sugar industry will assist to reduce impacts. Priority Details flower t p x x x p seed t p x x x p spray t x x x t p mechanical t t p t x t t p manual x x x t p p biocontrol t x x x x t p p t x x x J F M A M J J A S O N D Mimosa invisa (Giant sensitive plant) Biology x Peak t First/last flush p Occasional y n/a Control x Optimal t Good p Marginal y Not recommended Control Calendar Management requirements 1 2 3 4 5 Restricted matter category 6 0.0/5 1.5/5 4.0/5 4.3/5 2.8/5 3.8/5 2.0/5 3.0/5 3.3/5 53