Making Water Work: Integrating nutrient, waste and energy streams in agriculture development through hyacinth harvest and processing

This project investigated how invasive water hyacinth in the Fitzroy River could be transformed from an environmental management challenge into a productive agricultural resource. Originally introduced to Central Queensland as an ornamental plant, water hyacinth has become a significant aquatic weed due to its rapid growth, dense biomass and long-lived seed bank, reducing waterway health, impacting ecosystem condition and creating ongoing management costs for land managers and local councils. The project explored practical pathways for harvesting and reusing water hyacinth biomass, with a focus on its potential as a soil ameliorant for agricultural production in the Lower Fitzroy region. By removing nutrient-rich biomass from the waterway, the project also examined opportunities to reduce nutrient loads in the Fitzroy catchment, improve water quality flowing to the Great Barrier Reef and support healthier aquatic ecosystems. Research findings highlighted strong potential for water hyacinth to be repurposed into agricultural products such as compost, mulch and biochar, reducing reliance on imported soil amendments while supporting more circular approaches to land and water management. The project also assessed the economic feasibility of different beneficial end uses, including a cost-benefit analysis of harvesting and processing pathways to identify realistic implementation opportunities. By linking invasive weed management with nutrient recovery and agricultural development, the project provides a practical model for turning an environmental liability into a productive resource, with potential benefits for water quality, farming productivity, waste reduction and regional resource efficiency across northern Australia.

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