The leaflets mention what we think are reasonable responsibilities of citizens to prevent the spread of these invasive plants and to initiate their sustainable management. In two cases in particular (water hyacinth and creeping sensitive plant) this should be possible using self-sustaining biological control by introducing the plants’ own pests from their homelands (in tropical America). Such “biocontrol agents” are well-tested to make sure they will not affect other plants and are especially helpful in places like lake-edge swamps where people cannot easily venture to establish other forms of management because of crocodiles, hippopotamuses, bilharzia and dangerous currents.