Travel Sargassum seaweed, invader of Florida and Caribbean beaches, may be the ‘new norm’ September 18, 2019 Lisa Conley and David Oliver, Naples Daily News Comments Off on Sargassum seaweed, invader of Florida and Caribbean beaches, may be the ‘new norm’ If you've been to the Caribbean or Florida this past summer — or anytime the last few years — chances are you've encountered sargassum seaweed.