Five years after the end of a $2.1 million campaign to attack it, the invasive aquatic weed Ludwigia is back and 'as bad as ever,' clogging Sonoma County waterways like the Laguna de Santa Rosa.

Three years ago, Sonoma County declared war on ludwigia, a fast-spreading plant that was clogging west county waterways and providing safe harbor for West Nile-carrying mosquitoes to breed.