Satellites can spy the menace of invasive flowers in West Africa
Sometimes , flowers can be the villain . urine jacinth , with their apparently harmless reddish blue petals and profuse unripened leaves , have invaded tropical parts of Central Africa , including Benin . In Lake Nokoué in Cotonou , near the country ’s populous central coast , the hyacinths threaten to take over . In the last few decade , they have spread into dense colonies that block sunlight , crowd out aboriginal plants and wildlife , clog the watercourse and irrigation canals , and hinder villager as they judge to move and collect Pisces ....