Method for harvesting and processing water hyacinths, characterized in that the following steps are performed: a) the water hyacinths growing in an aquatic medium are cut； b) the water hyacinths are collected on board a barge at berth (1)； c) the collected water hyacinths are transferred onto draining racks (2) near the quayside； d) the drained hyacinths are washed with clean water； e) the washed water hyacinths are drained on vibrating belts (7) in order to remove some of the excess water； f) the water hyacinths are dried on a dryer (8) at a temperature of between 50 and 100° C. for 5 to 17 h； g) the water hyacinths and their seeds are steam-sterilised at a temperature of between 80 and 100° C. in order to sterilise them； h) the sterilised water hyacinths and seeds are ground in order to make profitable use thereof.
