Ludwigia peploides and Ludwigia hexapetala. Broadly, they're together referred to as water primrose. "They're more robust, they're more aggressive," said Bill Keiper, an aquatic biologist for EGLE ...

Nanci Fioravanti, Green-Wood’s landscape manager, was the first to identify the infestation of the floating water primrose, known as Ludwigia peploides, along the margins of the Sylvan Water pond and ...

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.

Five years after the end of a $2.1 million campaign to attack it, the invasive aquatic weed Ludwigia once more is clogging Sonoma County waterways. "It's back and it's as bad as ever," said Erik ...