Water is crucial fot greenhouse horticulture. We need te secure high-quality, fresh water in sufficent quantities to meet the demands of the sector, not least irrigation. A good deal of hard work is currently being invested in a closed water system that will minimise the burden on the environment and promote sustainable water consumption. Various 'Water' innovations are providing insight into impressive solutions that will allow us to optimally safeguard the quantity and quality of water, including treating of recycling rainwater and wastewater.